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Finding the Fourth Proportional to 88.10, 131.38 and 79

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Solution

The fourth proportional to 88.10, 131.38 and 79 is: 117.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.10 : 131.38 = 79 : x
  2. Step 2: Convert to fraction form
    88.10/131.38 = 79/x
  3. Step 3: Cross multiply
    88.10x = 131.38 × 79
  4. Step 4: Simplify right side
    88.10x = 10,379.02
  5. Step 5: Solve for x
    x = 10,379.02/88.10
  6. Step 6: Final answer
    x = 117.81

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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.