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Finding the Fourth Proportional to 88.68, 132.72 and 79.68

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Solution

The fourth proportional to 88.68, 132.72 and 79.68 is: 119.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.68 : 132.72 = 79.68 : x
  2. Step 2: Convert to fraction form
    88.68/132.72 = 79.68/x
  3. Step 3: Cross multiply
    88.68x = 132.72 × 79.68
  4. Step 4: Simplify right side
    88.68x = 10,575.13
  5. Step 5: Solve for x
    x = 10,575.13/88.68
  6. Step 6: Final answer
    x = 119.25

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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.