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Finding the Fourth Proportional to 580.35, 800.91 and 318.39

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Solution

The fourth proportional to 580.35, 800.91 and 318.39 is: 439.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.35 : 800.91 = 318.39 : x
  2. Step 2: Convert to fraction form
    580.35/800.91 = 318.39/x
  3. Step 3: Cross multiply
    580.35x = 800.91 × 318.39
  4. Step 4: Simplify right side
    580.35x = 255,001.73
  5. Step 5: Solve for x
    x = 255,001.73/580.35
  6. Step 6: Final answer
    x = 439.39

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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.