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Finding the Fourth Proportional to 282.43, 423.42 and 99.85

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Solution

The fourth proportional to 282.43, 423.42 and 99.85 is: 149.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.43 : 423.42 = 99.85 : x
  2. Step 2: Convert to fraction form
    282.43/423.42 = 99.85/x
  3. Step 3: Cross multiply
    282.43x = 423.42 × 99.85
  4. Step 4: Simplify right side
    282.43x = 42,278.49
  5. Step 5: Solve for x
    x = 42,278.49/282.43
  6. Step 6: Final answer
    x = 149.70

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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.