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Finding the Fourth Proportional to 966.60, 1,334.28 and 686.88

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Solution

The fourth proportional to 966.60, 1,334.28 and 686.88 is: 948.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.60 : 1,334.28 = 686.88 : x
  2. Step 2: Convert to fraction form
    966.60/1,334.28 = 686.88/x
  3. Step 3: Cross multiply
    966.60x = 1,334.28 × 686.88
  4. Step 4: Simplify right side
    966.60x = 916,490.25
  5. Step 5: Solve for x
    x = 916,490.25/966.60
  6. Step 6: Final answer
    x = 948.16

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1.5x scale

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.