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Finding the Fourth Proportional to 154.88, 232.11 and 86.40

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Solution

The fourth proportional to 154.88, 232.11 and 86.40 is: 129.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.88 : 232.11 = 86.40 : x
  2. Step 2: Convert to fraction form
    154.88/232.11 = 86.40/x
  3. Step 3: Cross multiply
    154.88x = 232.11 × 86.40
  4. Step 4: Simplify right side
    154.88x = 20,054.30
  5. Step 5: Solve for x
    x = 20,054.30/154.88
  6. Step 6: Final answer
    x = 129.49

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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.