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Finding the Fourth Proportional to 123.57, 185.40 and 51.48

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Solution

The fourth proportional to 123.57, 185.40 and 51.48 is: 77.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.57 : 185.40 = 51.48 : x
  2. Step 2: Convert to fraction form
    123.57/185.40 = 51.48/x
  3. Step 3: Cross multiply
    123.57x = 185.40 × 51.48
  4. Step 4: Simplify right side
    123.57x = 9,544.39
  5. Step 5: Solve for x
    x = 9,544.39/123.57
  6. Step 6: Final answer
    x = 77.24

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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.