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Finding the Fourth Proportional to 282.43, 423.18 and 145.28

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Solution

The fourth proportional to 282.43, 423.18 and 145.28 is: 217.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.43 : 423.18 = 145.28 : x
  2. Step 2: Convert to fraction form
    282.43/423.18 = 145.28/x
  3. Step 3: Cross multiply
    282.43x = 423.18 × 145.28
  4. Step 4: Simplify right side
    282.43x = 61,479.59
  5. Step 5: Solve for x
    x = 61,479.59/282.43
  6. Step 6: Final answer
    x = 217.68

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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.