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Finding the Fourth Proportional to 282.81, 423.59 and 138.22

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Solution

The fourth proportional to 282.81, 423.59 and 138.22 is: 207.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.81 : 423.59 = 138.22 : x
  2. Step 2: Convert to fraction form
    282.81/423.59 = 138.22/x
  3. Step 3: Cross multiply
    282.81x = 423.59 × 138.22
  4. Step 4: Simplify right side
    282.81x = 58,548.61
  5. Step 5: Solve for x
    x = 58,548.61/282.81
  6. Step 6: Final answer
    x = 207.02

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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.