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Finding the Fourth Proportional to 282.35, 423.49 and 99.72

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Solution

The fourth proportional to 282.35, 423.49 and 99.72 is: 149.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.35 : 423.49 = 99.72 : x
  2. Step 2: Convert to fraction form
    282.35/423.49 = 99.72/x
  3. Step 3: Cross multiply
    282.35x = 423.49 × 99.72
  4. Step 4: Simplify right side
    282.35x = 42,229.92
  5. Step 5: Solve for x
    x = 42,229.92/282.35
  6. Step 6: Final answer
    x = 149.57

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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.