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Finding the Fourth Proportional to 543,853.80, 815,780.70 and 493,990.20

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Solution

The fourth proportional to 543,853.80, 815,780.70 and 493,990.20 is: 740,985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,853.80 : 815,780.70 = 493,990.20 : x
  2. Step 2: Convert to fraction form
    543,853.80/815,780.70 = 493,990.20/x
  3. Step 3: Cross multiply
    543,853.80x = 815,780.70 × 493,990.20
  4. Step 4: Simplify right side
    543,853.80x = 402,987,671,149.14
  5. Step 5: Solve for x
    x = 402,987,671,149.14/543,853.80
  6. Step 6: Final answer
    x = 740,985.30

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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.