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Finding the Fourth Proportional to 579,425.20, 869,137.80 and 486,113.20

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Solution

The fourth proportional to 579,425.20, 869,137.80 and 486,113.20 is: 729,169.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,425.20 : 869,137.80 = 486,113.20 : x
  2. Step 2: Convert to fraction form
    579,425.20/869,137.80 = 486,113.20/x
  3. Step 3: Cross multiply
    579,425.20x = 869,137.80 × 486,113.20
  4. Step 4: Simplify right side
    579,425.20x = 422,499,357,198.96
  5. Step 5: Solve for x
    x = 422,499,357,198.96/579,425.20
  6. Step 6: Final answer
    x = 729,169.80

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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.