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Finding the Fourth Proportional to 691.26, 1,036.95 and 258.45

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Solution

The fourth proportional to 691.26, 1,036.95 and 258.45 is: 387.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.26 : 1,036.95 = 258.45 : x
  2. Step 2: Convert to fraction form
    691.26/1,036.95 = 258.45/x
  3. Step 3: Cross multiply
    691.26x = 1,036.95 × 258.45
  4. Step 4: Simplify right side
    691.26x = 267,999.73
  5. Step 5: Solve for x
    x = 267,999.73/691.26
  6. Step 6: Final answer
    x = 387.70

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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.