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Finding the Fourth Proportional to 439.55, 660.44 and 318.66

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Solution

The fourth proportional to 439.55, 660.44 and 318.66 is: 478.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.55 : 660.44 = 318.66 : x
  2. Step 2: Convert to fraction form
    439.55/660.44 = 318.66/x
  3. Step 3: Cross multiply
    439.55x = 660.44 × 318.66
  4. Step 4: Simplify right side
    439.55x = 210,455.81
  5. Step 5: Solve for x
    x = 210,455.81/439.55
  6. Step 6: Final answer
    x = 478.80

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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.