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Finding the Fourth Proportional to 201.61, 302.19 and 86.15

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Solution

The fourth proportional to 201.61, 302.19 and 86.15 is: 129.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.61 : 302.19 = 86.15 : x
  2. Step 2: Convert to fraction form
    201.61/302.19 = 86.15/x
  3. Step 3: Cross multiply
    201.61x = 302.19 × 86.15
  4. Step 4: Simplify right side
    201.61x = 26,033.67
  5. Step 5: Solve for x
    x = 26,033.67/201.61
  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.