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Finding the Fourth Proportional to 154.95, 232.45 and 86.46

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Solution

The fourth proportional to 154.95, 232.45 and 86.46 is: 129.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.95 : 232.45 = 86.46 : x
  2. Step 2: Convert to fraction form
    154.95/232.45 = 86.46/x
  3. Step 3: Cross multiply
    154.95x = 232.45 × 86.46
  4. Step 4: Simplify right side
    154.95x = 20,097.63
  5. Step 5: Solve for x
    x = 20,097.63/154.95
  6. Step 6: Final answer
    x = 129.70

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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.