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Finding the Fourth Proportional to 88.60, 121.25 and 86.59

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Solution

The fourth proportional to 88.60, 121.25 and 86.59 is: 118.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.60 : 121.25 = 86.59 : x
  2. Step 2: Convert to fraction form
    88.60/121.25 = 86.59/x
  3. Step 3: Cross multiply
    88.60x = 121.25 × 86.59
  4. Step 4: Simplify right side
    88.60x = 10,499.04
  5. Step 5: Solve for x
    x = 10,499.04/88.60
  6. Step 6: Final answer
    x = 118.50

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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.