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Finding the Fourth Proportional to 439.95, 660.05 and 316.32

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Solution

The fourth proportional to 439.95, 660.05 and 316.32 is: 474.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.95 : 660.05 = 316.32 : x
  2. Step 2: Convert to fraction form
    439.95/660.05 = 316.32/x
  3. Step 3: Cross multiply
    439.95x = 660.05 × 316.32
  4. Step 4: Simplify right side
    439.95x = 208,785.43
  5. Step 5: Solve for x
    x = 208,785.43/439.95
  6. Step 6: Final answer
    x = 474.57

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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.