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Finding the Fourth Proportional to 691.95, 1,037.79 and 258.87

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Solution

The fourth proportional to 691.95, 1,037.79 and 258.87 is: 388.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.95 : 1,037.79 = 258.87 : x
  2. Step 2: Convert to fraction form
    691.95/1,037.79 = 258.87/x
  3. Step 3: Cross multiply
    691.95x = 1,037.79 × 258.87
  4. Step 4: Simplify right side
    691.95x = 268,652.70
  5. Step 5: Solve for x
    x = 268,652.70/691.95
  6. Step 6: Final answer
    x = 388.25

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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.