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Finding the Fourth Proportional to 387.29, 580.99 and 113.40

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Solution

The fourth proportional to 387.29, 580.99 and 113.40 is: 170.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.29 : 580.99 = 113.40 : x
  2. Step 2: Convert to fraction form
    387.29/580.99 = 113.40/x
  3. Step 3: Cross multiply
    387.29x = 580.99 × 113.40
  4. Step 4: Simplify right side
    387.29x = 65,884.27
  5. Step 5: Solve for x
    x = 65,884.27/387.29
  6. Step 6: Final answer
    x = 170.12

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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.