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Finding the Fourth Proportional to 742.03, 1,112.61 and 545.20

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Solution

The fourth proportional to 742.03, 1,112.61 and 545.20 is: 817.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.03 : 1,112.61 = 545.20 : x
  2. Step 2: Convert to fraction form
    742.03/1,112.61 = 545.20/x
  3. Step 3: Cross multiply
    742.03x = 1,112.61 × 545.20
  4. Step 4: Simplify right side
    742.03x = 606,594.97
  5. Step 5: Solve for x
    x = 606,594.97/742.03
  6. Step 6: Final answer
    x = 817.48

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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.