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Finding the Fourth Proportional to 932.40, 1,288.98 and 686.16

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Solution

The fourth proportional to 932.40, 1,288.98 and 686.16 is: 948.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.40 : 1,288.98 = 686.16 : x
  2. Step 2: Convert to fraction form
    932.40/1,288.98 = 686.16/x
  3. Step 3: Cross multiply
    932.40x = 1,288.98 × 686.16
  4. Step 4: Simplify right side
    932.40x = 884,446.52
  5. Step 5: Solve for x
    x = 884,446.52/932.40
  6. Step 6: Final answer
    x = 948.57

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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.