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Finding the Fourth Proportional to 440.24, 660.12 and 318.80

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Solution

The fourth proportional to 440.24, 660.12 and 318.80 is: 478.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.24 : 660.12 = 318.80 : x
  2. Step 2: Convert to fraction form
    440.24/660.12 = 318.80/x
  3. Step 3: Cross multiply
    440.24x = 660.12 × 318.80
  4. Step 4: Simplify right side
    440.24x = 210,446.26
  5. Step 5: Solve for x
    x = 210,446.26/440.24
  6. Step 6: Final answer
    x = 478.03

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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.