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Finding the Fourth Proportional to 88.74, 121.74 and 86.46

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Solution

The fourth proportional to 88.74, 121.74 and 86.46 is: 118.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.74 : 121.74 = 86.46 : x
  2. Step 2: Convert to fraction form
    88.74/121.74 = 86.46/x
  3. Step 3: Cross multiply
    88.74x = 121.74 × 86.46
  4. Step 4: Simplify right side
    88.74x = 10,525.64
  5. Step 5: Solve for x
    x = 10,525.64/88.74
  6. Step 6: Final answer
    x = 118.61

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.