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Finding the Fourth Proportional to 86.68, 129.60 and 73.98

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Solution

The fourth proportional to 86.68, 129.60 and 73.98 is: 110.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.68 : 129.60 = 73.98 : x
  2. Step 2: Convert to fraction form
    86.68/129.60 = 73.98/x
  3. Step 3: Cross multiply
    86.68x = 129.60 × 73.98
  4. Step 4: Simplify right side
    86.68x = 9,587.81
  5. Step 5: Solve for x
    x = 9,587.81/86.68
  6. Step 6: Final answer
    x = 110.61

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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.