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Finding the Fourth Proportional to 742.13, 1,023.99 and 423.05

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Solution

The fourth proportional to 742.13, 1,023.99 and 423.05 is: 583.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.13 : 1,023.99 = 423.05 : x
  2. Step 2: Convert to fraction form
    742.13/1,023.99 = 423.05/x
  3. Step 3: Cross multiply
    742.13x = 1,023.99 × 423.05
  4. Step 4: Simplify right side
    742.13x = 433,198.97
  5. Step 5: Solve for x
    x = 433,198.97/742.13
  6. Step 6: Final answer
    x = 583.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.