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Finding the Fourth Proportional to 754.76, 1,129.11 and 653.15

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Solution

The fourth proportional to 754.76, 1,129.11 and 653.15 is: 977.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.76 : 1,129.11 = 653.15 : x
  2. Step 2: Convert to fraction form
    754.76/1,129.11 = 653.15/x
  3. Step 3: Cross multiply
    754.76x = 1,129.11 × 653.15
  4. Step 4: Simplify right side
    754.76x = 737,478.20
  5. Step 5: Solve for x
    x = 737,478.20/754.76
  6. Step 6: Final answer
    x = 977.10

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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.