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Finding the Fourth Proportional to 342.80, 514.19 and 86.30

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Solution

The fourth proportional to 342.80, 514.19 and 86.30 is: 129.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.80 : 514.19 = 86.30 : x
  2. Step 2: Convert to fraction form
    342.80/514.19 = 86.30/x
  3. Step 3: Cross multiply
    342.80x = 514.19 × 86.30
  4. Step 4: Simplify right side
    342.80x = 44,372.24
  5. Step 5: Solve for x
    x = 44,372.24/342.80
  6. Step 6: Final answer
    x = 129.44

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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.