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Finding the Fourth Proportional to 691.28, 1,037.16 and 258.72

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Solution

The fourth proportional to 691.28, 1,037.16 and 258.72 is: 388.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.28 : 1,037.16 = 258.72 : x
  2. Step 2: Convert to fraction form
    691.28/1,037.16 = 258.72/x
  3. Step 3: Cross multiply
    691.28x = 1,037.16 × 258.72
  4. Step 4: Simplify right side
    691.28x = 268,334.04
  5. Step 5: Solve for x
    x = 268,334.04/691.28
  6. Step 6: Final answer
    x = 388.17

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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.