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Finding the Fourth Proportional to 152.11, 209.90 and 86.61

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Solution

The fourth proportional to 152.11, 209.90 and 86.61 is: 119.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.11 : 209.90 = 86.61 : x
  2. Step 2: Convert to fraction form
    152.11/209.90 = 86.61/x
  3. Step 3: Cross multiply
    152.11x = 209.90 × 86.61
  4. Step 4: Simplify right side
    152.11x = 18,178.39
  5. Step 5: Solve for x
    x = 18,178.39/152.11
  6. Step 6: Final answer
    x = 119.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.