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Finding the Fourth Proportional to 1,129.12, 1,557.96 and 686.92

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Solution

The fourth proportional to 1,129.12, 1,557.96 and 686.92 is: 947.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.12 : 1,557.96 = 686.92 : x
  2. Step 2: Convert to fraction form
    1,129.12/1,557.96 = 686.92/x
  3. Step 3: Cross multiply
    1,129.12x = 1,557.96 × 686.92
  4. Step 4: Simplify right side
    1,129.12x = 1,070,193.88
  5. Step 5: Solve for x
    x = 1,070,193.88/1,129.12
  6. Step 6: Final answer
    x = 947.81

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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.