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Finding the Fourth Proportional to 387.10, 580.65 and 113.38

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Solution

The fourth proportional to 387.10, 580.65 and 113.38 is: 170.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.10 : 580.65 = 113.38 : x
  2. Step 2: Convert to fraction form
    387.10/580.65 = 113.38/x
  3. Step 3: Cross multiply
    387.10x = 580.65 × 113.38
  4. Step 4: Simplify right side
    387.10x = 65,832.22
  5. Step 5: Solve for x
    x = 65,832.22/387.10
  6. Step 6: Final answer
    x = 170.07

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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.