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Finding the Fourth Proportional to 123.71, 185.21 and 75.47

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Solution

The fourth proportional to 123.71, 185.21 and 75.47 is: 112.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.71 : 185.21 = 75.47 : x
  2. Step 2: Convert to fraction form
    123.71/185.21 = 75.47/x
  3. Step 3: Cross multiply
    123.71x = 185.21 × 75.47
  4. Step 4: Simplify right side
    123.71x = 13,977.42
  5. Step 5: Solve for x
    x = 13,977.42/123.71
  6. Step 6: Final answer
    x = 112.99

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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.