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Finding the Fourth Proportional to 342.80, 514.40 and 206.18

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Solution

The fourth proportional to 342.80, 514.40 and 206.18 is: 309.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.80 : 514.40 = 206.18 : x
  2. Step 2: Convert to fraction form
    342.80/514.40 = 206.18/x
  3. Step 3: Cross multiply
    342.80x = 514.40 × 206.18
  4. Step 4: Simplify right side
    342.80x = 106,057.96
  5. Step 5: Solve for x
    x = 106,057.96/342.80
  6. Step 6: Final answer
    x = 309.39

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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.