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Finding the Fourth Proportional to 201.68, 302.42 and 86.12

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Solution

The fourth proportional to 201.68, 302.42 and 86.12 is: 129.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.68 : 302.42 = 86.12 : x
  2. Step 2: Convert to fraction form
    201.68/302.42 = 86.12/x
  3. Step 3: Cross multiply
    201.68x = 302.42 × 86.12
  4. Step 4: Simplify right side
    201.68x = 26,043.11
  5. Step 5: Solve for x
    x = 26,043.11/201.68
  6. Step 6: Final answer
    x = 129.13

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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.