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Finding the Fourth Proportional to 691.79, 1,037.32 and 258.59

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Solution

The fourth proportional to 691.79, 1,037.32 and 258.59 is: 387.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.79 : 1,037.32 = 258.59 : x
  2. Step 2: Convert to fraction form
    691.79/1,037.32 = 258.59/x
  3. Step 3: Cross multiply
    691.79x = 1,037.32 × 258.59
  4. Step 4: Simplify right side
    691.79x = 268,240.58
  5. Step 5: Solve for x
    x = 268,240.58/691.79
  6. Step 6: Final answer
    x = 387.75

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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.