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Finding the Fourth Proportional to 912.64, 1,256.34 and 691.24

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Solution

The fourth proportional to 912.64, 1,256.34 and 691.24 is: 951.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.64 : 1,256.34 = 691.24 : x
  2. Step 2: Convert to fraction form
    912.64/1,256.34 = 691.24/x
  3. Step 3: Cross multiply
    912.64x = 1,256.34 × 691.24
  4. Step 4: Simplify right side
    912.64x = 868,432.46
  5. Step 5: Solve for x
    x = 868,432.46/912.64
  6. Step 6: Final answer
    x = 951.56

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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.