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Finding the Fourth Proportional to 748.56, 1,121.40 and 611.76

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Solution

The fourth proportional to 748.56, 1,121.40 and 611.76 is: 916.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.56 : 1,121.40 = 611.76 : x
  2. Step 2: Convert to fraction form
    748.56/1,121.40 = 611.76/x
  3. Step 3: Cross multiply
    748.56x = 1,121.40 × 611.76
  4. Step 4: Simplify right side
    748.56x = 686,027.66
  5. Step 5: Solve for x
    x = 686,027.66/748.56
  6. Step 6: Final answer
    x = 916.46

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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.