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Finding the Fourth Proportional to 114.92, 172.15 and 87.54

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Solution

The fourth proportional to 114.92, 172.15 and 87.54 is: 131.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.92 : 172.15 = 87.54 : x
  2. Step 2: Convert to fraction form
    114.92/172.15 = 87.54/x
  3. Step 3: Cross multiply
    114.92x = 172.15 × 87.54
  4. Step 4: Simplify right side
    114.92x = 15,070.01
  5. Step 5: Solve for x
    x = 15,070.01/114.92
  6. Step 6: Final answer
    x = 131.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.