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Finding the Fourth Proportional to 508.74, 764.60 and 422.61

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Solution

The fourth proportional to 508.74, 764.60 and 422.61 is: 635.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.74 : 764.60 = 422.61 : x
  2. Step 2: Convert to fraction form
    508.74/764.60 = 422.61/x
  3. Step 3: Cross multiply
    508.74x = 764.60 × 422.61
  4. Step 4: Simplify right side
    508.74x = 323,125.49
  5. Step 5: Solve for x
    x = 323,125.49/508.74
  6. Step 6: Final answer
    x = 635.15

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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.