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Finding the Fourth Proportional to 1,557.68, 2,336.92 and 691.78

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Solution

The fourth proportional to 1,557.68, 2,336.92 and 691.78 is: 1,037.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.68 : 2,336.92 = 691.78 : x
  2. Step 2: Convert to fraction form
    1,557.68/2,336.92 = 691.78/x
  3. Step 3: Cross multiply
    1,557.68x = 2,336.92 × 691.78
  4. Step 4: Simplify right side
    1,557.68x = 1,616,634.52
  5. Step 5: Solve for x
    x = 1,616,634.52/1,557.68
  6. Step 6: Final answer
    x = 1,037.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.