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Finding the Fourth Proportional to 543,356.20, 815,034.30 and 431,381.80

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Solution

The fourth proportional to 543,356.20, 815,034.30 and 431,381.80 is: 647,072.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,356.20 : 815,034.30 = 431,381.80 : x
  2. Step 2: Convert to fraction form
    543,356.20/815,034.30 = 431,381.80/x
  3. Step 3: Cross multiply
    543,356.20x = 815,034.30 × 431,381.80
  4. Step 4: Simplify right side
    543,356.20x = 351,590,963,395.74
  5. Step 5: Solve for x
    x = 351,590,963,395.74/543,356.20
  6. Step 6: Final answer
    x = 647,072.70

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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.