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Finding the Fourth Proportional to 691.30, 1,037.01 and 258.35

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Solution

The fourth proportional to 691.30, 1,037.01 and 258.35 is: 387.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.30 : 1,037.01 = 258.35 : x
  2. Step 2: Convert to fraction form
    691.30/1,037.01 = 258.35/x
  3. Step 3: Cross multiply
    691.30x = 1,037.01 × 258.35
  4. Step 4: Simplify right side
    691.30x = 267,911.53
  5. Step 5: Solve for x
    x = 267,911.53/691.30
  6. Step 6: Final answer
    x = 387.55

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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.