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Finding the Fourth Proportional to 932.16, 1,278 and 915.78

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Solution

The fourth proportional to 932.16, 1,278 and 915.78 is: 1,255.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.16 : 1,278 = 915.78 : x
  2. Step 2: Convert to fraction form
    932.16/1,278 = 915.78/x
  3. Step 3: Cross multiply
    932.16x = 1,278 × 915.78
  4. Step 4: Simplify right side
    932.16x = 1,170,366.84
  5. Step 5: Solve for x
    x = 1,170,366.84/932.16
  6. Step 6: Final answer
    x = 1,255.54

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.