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Finding the Fourth Proportional to 915.90, 1,263.92 and 522.88

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Solution

The fourth proportional to 915.90, 1,263.92 and 522.88 is: 721.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.90 : 1,263.92 = 522.88 : x
  2. Step 2: Convert to fraction form
    915.90/1,263.92 = 522.88/x
  3. Step 3: Cross multiply
    915.90x = 1,263.92 × 522.88
  4. Step 4: Simplify right side
    915.90x = 660,878.49
  5. Step 5: Solve for x
    x = 660,878.49/915.90
  6. Step 6: Final answer
    x = 721.56

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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.