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Finding the Fourth Proportional to 282.38, 423.59 and 128.40

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Solution

The fourth proportional to 282.38, 423.59 and 128.40 is: 192.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.38 : 423.59 = 128.40 : x
  2. Step 2: Convert to fraction form
    282.38/423.59 = 128.40/x
  3. Step 3: Cross multiply
    282.38x = 423.59 × 128.40
  4. Step 4: Simplify right side
    282.38x = 54,388.31
  5. Step 5: Solve for x
    x = 54,388.31/282.38
  6. Step 6: Final answer
    x = 192.61

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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.