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Finding the Fourth Proportional to 742.18, 1,113.79 and 547.69

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Solution

The fourth proportional to 742.18, 1,113.79 and 547.69 is: 821.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.18 : 1,113.79 = 547.69 : x
  2. Step 2: Convert to fraction form
    742.18/1,113.79 = 547.69/x
  3. Step 3: Cross multiply
    742.18x = 1,113.79 × 547.69
  4. Step 4: Simplify right side
    742.18x = 610,006.08
  5. Step 5: Solve for x
    x = 610,006.08/742.18
  6. Step 6: Final answer
    x = 821.91

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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.