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Finding the Fourth Proportional to 915.14, 1,261.92 and 691.59

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Solution

The fourth proportional to 915.14, 1,261.92 and 691.59 is: 953.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.14 : 1,261.92 = 691.59 : x
  2. Step 2: Convert to fraction form
    915.14/1,261.92 = 691.59/x
  3. Step 3: Cross multiply
    915.14x = 1,261.92 × 691.59
  4. Step 4: Simplify right side
    915.14x = 872,731.25
  5. Step 5: Solve for x
    x = 872,731.25/915.14
  6. Step 6: Final answer
    x = 953.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.