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Finding the Fourth Proportional to 510.72, 764.87 and 429.32

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Solution

The fourth proportional to 510.72, 764.87 and 429.32 is: 642.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.72 : 764.87 = 429.32 : x
  2. Step 2: Convert to fraction form
    510.72/764.87 = 429.32/x
  3. Step 3: Cross multiply
    510.72x = 764.87 × 429.32
  4. Step 4: Simplify right side
    510.72x = 328,373.30
  5. Step 5: Solve for x
    x = 328,373.30/510.72
  6. Step 6: Final answer
    x = 642.96

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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.