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Finding the Fourth Proportional to 80.88, 111.60 and 48.12

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Solution

The fourth proportional to 80.88, 111.60 and 48.12 is: 66.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.88 : 111.60 = 48.12 : x
  2. Step 2: Convert to fraction form
    80.88/111.60 = 48.12/x
  3. Step 3: Cross multiply
    80.88x = 111.60 × 48.12
  4. Step 4: Simplify right side
    80.88x = 5,370.19
  5. Step 5: Solve for x
    x = 5,370.19/80.88
  6. Step 6: Final answer
    x = 66.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.