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Finding the Fourth Proportional to 748.16, 1,121.69 and 458.72

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Solution

The fourth proportional to 748.16, 1,121.69 and 458.72 is: 687.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.16 : 1,121.69 = 458.72 : x
  2. Step 2: Convert to fraction form
    748.16/1,121.69 = 458.72/x
  3. Step 3: Cross multiply
    748.16x = 1,121.69 × 458.72
  4. Step 4: Simplify right side
    748.16x = 514,541.64
  5. Step 5: Solve for x
    x = 514,541.64/748.16
  6. Step 6: Final answer
    x = 687.74

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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.