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Finding the Fourth Proportional to 440.60, 660.30 and 312.20

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Solution

The fourth proportional to 440.60, 660.30 and 312.20 is: 467.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.60 : 660.30 = 312.20 : x
  2. Step 2: Convert to fraction form
    440.60/660.30 = 312.20/x
  3. Step 3: Cross multiply
    440.60x = 660.30 × 312.20
  4. Step 4: Simplify right side
    440.60x = 206,145.66
  5. Step 5: Solve for x
    x = 206,145.66/440.60
  6. Step 6: Final answer
    x = 467.87

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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.