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Finding the Fourth Proportional to 742.29, 1,113.21 and 279.73

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Solution

The fourth proportional to 742.29, 1,113.21 and 279.73 is: 419.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.29 : 1,113.21 = 279.73 : x
  2. Step 2: Convert to fraction form
    742.29/1,113.21 = 279.73/x
  3. Step 3: Cross multiply
    742.29x = 1,113.21 × 279.73
  4. Step 4: Simplify right side
    742.29x = 311,398.23
  5. Step 5: Solve for x
    x = 311,398.23/742.29
  6. Step 6: Final answer
    x = 419.51

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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.