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Finding the Fourth Proportional to 342.40, 512.58 and 220.30

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Solution

The fourth proportional to 342.40, 512.58 and 220.30 is: 329.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.40 : 512.58 = 220.30 : x
  2. Step 2: Convert to fraction form
    342.40/512.58 = 220.30/x
  3. Step 3: Cross multiply
    342.40x = 512.58 × 220.30
  4. Step 4: Simplify right side
    342.40x = 112,921.37
  5. Step 5: Solve for x
    x = 112,921.37/342.40
  6. Step 6: Final answer
    x = 329.79

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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.