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Finding the Fourth Proportional to 123.18, 184.78 and 54.72

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Solution

The fourth proportional to 123.18, 184.78 and 54.72 is: 82.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.18 : 184.78 = 54.72 : x
  2. Step 2: Convert to fraction form
    123.18/184.78 = 54.72/x
  3. Step 3: Cross multiply
    123.18x = 184.78 × 54.72
  4. Step 4: Simplify right side
    123.18x = 10,110.24
  5. Step 5: Solve for x
    x = 10,110.24/123.18
  6. Step 6: Final answer
    x = 82.08

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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.