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Finding the Fourth Proportional to 543,365.70, 815,048.55 and 431,391.30

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Solution

The fourth proportional to 543,365.70, 815,048.55 and 431,391.30 is: 647,086.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,365.70 : 815,048.55 = 431,391.30 : x
  2. Step 2: Convert to fraction form
    543,365.70/815,048.55 = 431,391.30/x
  3. Step 3: Cross multiply
    543,365.70x = 815,048.55 × 431,391.30
  4. Step 4: Simplify right side
    543,365.70x = 351,604,853,547.62
  5. Step 5: Solve for x
    x = 351,604,853,547.62/543,365.70
  6. Step 6: Final answer
    x = 647,086.95

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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.