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Finding the Fourth Proportional to 88.15, 131.66 and 79.90

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Solution

The fourth proportional to 88.15, 131.66 and 79.90 is: 119.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.15 : 131.66 = 79.90 : x
  2. Step 2: Convert to fraction form
    88.15/131.66 = 79.90/x
  3. Step 3: Cross multiply
    88.15x = 131.66 × 79.90
  4. Step 4: Simplify right side
    88.15x = 10,519.63
  5. Step 5: Solve for x
    x = 10,519.63/88.15
  6. Step 6: Final answer
    x = 119.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.