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Finding the Fourth Proportional to 642.32, 958.72 and 626.78

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Solution

The fourth proportional to 642.32, 958.72 and 626.78 is: 935.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.32 : 958.72 = 626.78 : x
  2. Step 2: Convert to fraction form
    642.32/958.72 = 626.78/x
  3. Step 3: Cross multiply
    642.32x = 958.72 × 626.78
  4. Step 4: Simplify right side
    642.32x = 600,901.73
  5. Step 5: Solve for x
    x = 600,901.73/642.32
  6. Step 6: Final answer
    x = 935.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.