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Finding the Fourth Proportional to 580.80, 801.42 and 318.78

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Solution

The fourth proportional to 580.80, 801.42 and 318.78 is: 439.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.80 : 801.42 = 318.78 : x
  2. Step 2: Convert to fraction form
    580.80/801.42 = 318.78/x
  3. Step 3: Cross multiply
    580.80x = 801.42 × 318.78
  4. Step 4: Simplify right side
    580.80x = 255,476.67
  5. Step 5: Solve for x
    x = 255,476.67/580.80
  6. Step 6: Final answer
    x = 439.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.