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Finding the Fourth Proportional to 387.10, 581.33 and 371.15

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Solution

The fourth proportional to 387.10, 581.33 and 371.15 is: 557.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.10 : 581.33 = 371.15 : x
  2. Step 2: Convert to fraction form
    387.10/581.33 = 371.15/x
  3. Step 3: Cross multiply
    387.10x = 581.33 × 371.15
  4. Step 4: Simplify right side
    387.10x = 215,758.74
  5. Step 5: Solve for x
    x = 215,758.74/387.10
  6. Step 6: Final answer
    x = 557.38

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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.