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Finding the Fourth Proportional to 691.39, 1,037.85 and 383.54

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Solution

The fourth proportional to 691.39, 1,037.85 and 383.54 is: 575.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.39 : 1,037.85 = 383.54 : x
  2. Step 2: Convert to fraction form
    691.39/1,037.85 = 383.54/x
  3. Step 3: Cross multiply
    691.39x = 1,037.85 × 383.54
  4. Step 4: Simplify right side
    691.39x = 398,059.58
  5. Step 5: Solve for x
    x = 398,059.58/691.39
  6. Step 6: Final answer
    x = 575.74

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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.