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Finding the Fourth Proportional to 966.21, 1,331.58 and 686.46

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Solution

The fourth proportional to 966.21, 1,331.58 and 686.46 is: 946.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.21 : 1,331.58 = 686.46 : x
  2. Step 2: Convert to fraction form
    966.21/1,331.58 = 686.46/x
  3. Step 3: Cross multiply
    966.21x = 1,331.58 × 686.46
  4. Step 4: Simplify right side
    966.21x = 914,076.41
  5. Step 5: Solve for x
    x = 914,076.41/966.21
  6. Step 6: Final answer
    x = 946.04

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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.