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Finding the Fourth Proportional to 747.10, 1,121.55 and 741.70

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Solution

The fourth proportional to 747.10, 1,121.55 and 741.70 is: 1,113.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.10 : 1,121.55 = 741.70 : x
  2. Step 2: Convert to fraction form
    747.10/1,121.55 = 741.70/x
  3. Step 3: Cross multiply
    747.10x = 1,121.55 × 741.70
  4. Step 4: Simplify right side
    747.10x = 831,853.64
  5. Step 5: Solve for x
    x = 831,853.64/747.10
  6. Step 6: Final answer
    x = 1,113.44

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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.