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Finding the Fourth Proportional to 387.85, 580.05 and 344.79

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Solution

The fourth proportional to 387.85, 580.05 and 344.79 is: 515.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.85 : 580.05 = 344.79 : x
  2. Step 2: Convert to fraction form
    387.85/580.05 = 344.79/x
  3. Step 3: Cross multiply
    387.85x = 580.05 × 344.79
  4. Step 4: Simplify right side
    387.85x = 199,995.44
  5. Step 5: Solve for x
    x = 199,995.44/387.85
  6. Step 6: Final answer
    x = 515.65

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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.