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Finding the Fourth Proportional to 1,229.94, 1,695.96 and 915.78

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Solution

The fourth proportional to 1,229.94, 1,695.96 and 915.78 is: 1,262.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.94 : 1,695.96 = 915.78 : x
  2. Step 2: Convert to fraction form
    1,229.94/1,695.96 = 915.78/x
  3. Step 3: Cross multiply
    1,229.94x = 1,695.96 × 915.78
  4. Step 4: Simplify right side
    1,229.94x = 1,553,126.25
  5. Step 5: Solve for x
    x = 1,553,126.25/1,229.94
  6. Step 6: Final answer
    x = 1,262.77

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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.