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Finding the Fourth Proportional to 634.64, 876.12 and 428.72

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Solution

The fourth proportional to 634.64, 876.12 and 428.72 is: 591.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.64 : 876.12 = 428.72 : x
  2. Step 2: Convert to fraction form
    634.64/876.12 = 428.72/x
  3. Step 3: Cross multiply
    634.64x = 876.12 × 428.72
  4. Step 4: Simplify right side
    634.64x = 375,610.17
  5. Step 5: Solve for x
    x = 375,610.17/634.64
  6. Step 6: Final answer
    x = 591.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.