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Finding the Fourth Proportional to 88.54, 121.35 and 87.64

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Solution

The fourth proportional to 88.54, 121.35 and 87.64 is: 120.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.54 : 121.35 = 87.64 : x
  2. Step 2: Convert to fraction form
    88.54/121.35 = 87.64/x
  3. Step 3: Cross multiply
    88.54x = 121.35 × 87.64
  4. Step 4: Simplify right side
    88.54x = 10,635.11
  5. Step 5: Solve for x
    x = 10,635.11/88.54
  6. Step 6: Final answer
    x = 120.12

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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.