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Finding the Fourth Proportional to 915.18, 1,369.58 and 748.73

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Solution

The fourth proportional to 915.18, 1,369.58 and 748.73 is: 1,120.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.18 : 1,369.58 = 748.73 : x
  2. Step 2: Convert to fraction form
    915.18/1,369.58 = 748.73/x
  3. Step 3: Cross multiply
    915.18x = 1,369.58 × 748.73
  4. Step 4: Simplify right side
    915.18x = 1,025,435.04
  5. Step 5: Solve for x
    x = 1,025,435.04/915.18
  6. Step 6: Final answer
    x = 1,120.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.