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Finding the Fourth Proportional to 282.28, 423.48 and 138.08

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Solution

The fourth proportional to 282.28, 423.48 and 138.08 is: 207.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.28 : 423.48 = 138.08 : x
  2. Step 2: Convert to fraction form
    282.28/423.48 = 138.08/x
  3. Step 3: Cross multiply
    282.28x = 423.48 × 138.08
  4. Step 4: Simplify right side
    282.28x = 58,474.12
  5. Step 5: Solve for x
    x = 58,474.12/282.28
  6. Step 6: Final answer
    x = 207.15

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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.