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Finding the Fourth Proportional to 88.12, 131.88 and 79.72

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Solution

The fourth proportional to 88.12, 131.88 and 79.72 is: 119.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.12 : 131.88 = 79.72 : x
  2. Step 2: Convert to fraction form
    88.12/131.88 = 79.72/x
  3. Step 3: Cross multiply
    88.12x = 131.88 × 79.72
  4. Step 4: Simplify right side
    88.12x = 10,513.47
  5. Step 5: Solve for x
    x = 10,513.47/88.12
  6. Step 6: Final answer
    x = 119.31

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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.