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Finding the Fourth Proportional to 123.65, 185.47 and 55.18

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Solution

The fourth proportional to 123.65, 185.47 and 55.18 is: 82.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.65 : 185.47 = 55.18 : x
  2. Step 2: Convert to fraction form
    123.65/185.47 = 55.18/x
  3. Step 3: Cross multiply
    123.65x = 185.47 × 55.18
  4. Step 4: Simplify right side
    123.65x = 10,234.23
  5. Step 5: Solve for x
    x = 10,234.23/123.65
  6. Step 6: Final answer
    x = 82.77

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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.