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Finding the Fourth Proportional to 88.57, 121.46 and 87.55

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Solution

The fourth proportional to 88.57, 121.46 and 87.55 is: 120.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.57 : 121.46 = 87.55 : x
  2. Step 2: Convert to fraction form
    88.57/121.46 = 87.55/x
  3. Step 3: Cross multiply
    88.57x = 121.46 × 87.55
  4. Step 4: Simplify right side
    88.57x = 10,633.39
  5. Step 5: Solve for x
    x = 10,633.39/88.57
  6. Step 6: Final answer
    x = 120.06

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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.