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Finding the Fourth Proportional to 580.79, 801.42 and 318.80

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Solution

The fourth proportional to 580.79, 801.42 and 318.80 is: 439.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.79 : 801.42 = 318.80 : x
  2. Step 2: Convert to fraction form
    580.79/801.42 = 318.80/x
  3. Step 3: Cross multiply
    580.79x = 801.42 × 318.80
  4. Step 4: Simplify right side
    580.79x = 255,488.69
  5. Step 5: Solve for x
    x = 255,488.69/580.79
  6. Step 6: Final answer
    x = 439.90

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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.