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Finding the Fourth Proportional to 966.60, 1,449 and 641.88

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Solution

The fourth proportional to 966.60, 1,449 and 641.88 is: 962.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.60 : 1,449 = 641.88 : x
  2. Step 2: Convert to fraction form
    966.60/1,449 = 641.88/x
  3. Step 3: Cross multiply
    966.60x = 1,449 × 641.88
  4. Step 4: Simplify right side
    966.60x = 930,084.12
  5. Step 5: Solve for x
    x = 930,084.12/966.60
  6. Step 6: Final answer
    x = 962.22

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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.