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Finding the Fourth Proportional to 915.22, 1,263.06 and 542.15

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Solution

The fourth proportional to 915.22, 1,263.06 and 542.15 is: 748.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.22 : 1,263.06 = 542.15 : x
  2. Step 2: Convert to fraction form
    915.22/1,263.06 = 542.15/x
  3. Step 3: Cross multiply
    915.22x = 1,263.06 × 542.15
  4. Step 4: Simplify right side
    915.22x = 684,767.98
  5. Step 5: Solve for x
    x = 684,767.98/915.22
  6. Step 6: Final answer
    x = 748.20

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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.