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Finding the Fourth Proportional to 88.53, 121.35 and 87.12

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Solution

The fourth proportional to 88.53, 121.35 and 87.12 is: 119.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.53 : 121.35 = 87.12 : x
  2. Step 2: Convert to fraction form
    88.53/121.35 = 87.12/x
  3. Step 3: Cross multiply
    88.53x = 121.35 × 87.12
  4. Step 4: Simplify right side
    88.53x = 10,572.01
  5. Step 5: Solve for x
    x = 10,572.01/88.53
  6. Step 6: Final answer
    x = 119.42

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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.