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Finding the Fourth Proportional to 282.27, 423.61 and 99.81

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Solution

The fourth proportional to 282.27, 423.61 and 99.81 is: 149.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.27 : 423.61 = 99.81 : x
  2. Step 2: Convert to fraction form
    282.27/423.61 = 99.81/x
  3. Step 3: Cross multiply
    282.27x = 423.61 × 99.81
  4. Step 4: Simplify right side
    282.27x = 42,280.51
  5. Step 5: Solve for x
    x = 42,280.51/282.27
  6. Step 6: Final answer
    x = 149.79

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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.