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Finding the Fourth Proportional to 440.12, 660.81 and 318.98

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Solution

The fourth proportional to 440.12, 660.81 and 318.98 is: 478.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.12 : 660.81 = 318.98 : x
  2. Step 2: Convert to fraction form
    440.12/660.81 = 318.98/x
  3. Step 3: Cross multiply
    440.12x = 660.81 × 318.98
  4. Step 4: Simplify right side
    440.12x = 210,785.17
  5. Step 5: Solve for x
    x = 210,785.17/440.12
  6. Step 6: Final answer
    x = 478.93

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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.