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Finding the Fourth Proportional to 342.68, 514.04 and 86.18

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Solution

The fourth proportional to 342.68, 514.04 and 86.18 is: 129.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.68 : 514.04 = 86.18 : x
  2. Step 2: Convert to fraction form
    342.68/514.04 = 86.18/x
  3. Step 3: Cross multiply
    342.68x = 514.04 × 86.18
  4. Step 4: Simplify right side
    342.68x = 44,299.97
  5. Step 5: Solve for x
    x = 44,299.97/342.68
  6. Step 6: Final answer
    x = 129.28

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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.