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Finding the Fourth Proportional to 86.61, 129.81 and 35.22

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Solution

The fourth proportional to 86.61, 129.81 and 35.22 is: 52.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.61 : 129.81 = 35.22 : x
  2. Step 2: Convert to fraction form
    86.61/129.81 = 35.22/x
  3. Step 3: Cross multiply
    86.61x = 129.81 × 35.22
  4. Step 4: Simplify right side
    86.61x = 4,572.26
  5. Step 5: Solve for x
    x = 4,572.26/86.61
  6. Step 6: Final answer
    x = 52.79

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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.