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Finding the Fourth Proportional to 86.97, 130.47 and 79.41

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Solution

The fourth proportional to 86.97, 130.47 and 79.41 is: 119.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.97 : 130.47 = 79.41 : x
  2. Step 2: Convert to fraction form
    86.97/130.47 = 79.41/x
  3. Step 3: Cross multiply
    86.97x = 130.47 × 79.41
  4. Step 4: Simplify right side
    86.97x = 10,360.62
  5. Step 5: Solve for x
    x = 10,360.62/86.97
  6. Step 6: Final answer
    x = 119.13

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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.