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Finding the Fourth Proportional to 742.43, 1,113.81 and 280.22

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Solution

The fourth proportional to 742.43, 1,113.81 and 280.22 is: 420.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.43 : 1,113.81 = 280.22 : x
  2. Step 2: Convert to fraction form
    742.43/1,113.81 = 280.22/x
  3. Step 3: Cross multiply
    742.43x = 1,113.81 × 280.22
  4. Step 4: Simplify right side
    742.43x = 312,106.27
  5. Step 5: Solve for x
    x = 312,106.27/742.43
  6. Step 6: Final answer
    x = 420.39

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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.