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Finding the Fourth Proportional to 638.55, 956.21 and 529.20

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Solution

The fourth proportional to 638.55, 956.21 and 529.20 is: 792.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.55 : 956.21 = 529.20 : x
  2. Step 2: Convert to fraction form
    638.55/956.21 = 529.20/x
  3. Step 3: Cross multiply
    638.55x = 956.21 × 529.20
  4. Step 4: Simplify right side
    638.55x = 506,023.69
  5. Step 5: Solve for x
    x = 506,023.69/638.55
  6. Step 6: Final answer
    x = 792.46

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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.