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Finding the Fourth Proportional to 572,490.20, 858,000.90 and 319,770.20

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Solution

The fourth proportional to 572,490.20, 858,000.90 and 319,770.20 is: 479,245.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,490.20 : 858,000.90 = 319,770.20 : x
  2. Step 2: Convert to fraction form
    572,490.20/858,000.90 = 319,770.20/x
  3. Step 3: Cross multiply
    572,490.20x = 858,000.90 × 319,770.20
  4. Step 4: Simplify right side
    572,490.20x = 274,363,119,393.18
  5. Step 5: Solve for x
    x = 274,363,119,393.18/572,490.20
  6. Step 6: Final answer
    x = 479,245.09

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.