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Finding the Fourth Proportional to 202.17, 303.18 and 86.61

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Solution

The fourth proportional to 202.17, 303.18 and 86.61 is: 129.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.17 : 303.18 = 86.61 : x
  2. Step 2: Convert to fraction form
    202.17/303.18 = 86.61/x
  3. Step 3: Cross multiply
    202.17x = 303.18 × 86.61
  4. Step 4: Simplify right side
    202.17x = 26,258.42
  5. Step 5: Solve for x
    x = 26,258.42/202.17
  6. Step 6: Final answer
    x = 129.88

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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.