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Finding the Fourth Proportional to 282.92, 424.37 and 128.81

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Solution

The fourth proportional to 282.92, 424.37 and 128.81 is: 193.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.92 : 424.37 = 128.81 : x
  2. Step 2: Convert to fraction form
    282.92/424.37 = 128.81/x
  3. Step 3: Cross multiply
    282.92x = 424.37 × 128.81
  4. Step 4: Simplify right side
    282.92x = 54,663.10
  5. Step 5: Solve for x
    x = 54,663.10/282.92
  6. Step 6: Final answer
    x = 193.21

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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.