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Finding the Fourth Proportional to 499.78, 747.66 and 432.03

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Solution

The fourth proportional to 499.78, 747.66 and 432.03 is: 646.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.78 : 747.66 = 432.03 : x
  2. Step 2: Convert to fraction form
    499.78/747.66 = 432.03/x
  3. Step 3: Cross multiply
    499.78x = 747.66 × 432.03
  4. Step 4: Simplify right side
    499.78x = 323,011.55
  5. Step 5: Solve for x
    x = 323,011.55/499.78
  6. Step 6: Final answer
    x = 646.31

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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.