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Finding the Fourth Proportional to 387.43, 581.13 and 98.87

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Solution

The fourth proportional to 387.43, 581.13 and 98.87 is: 148.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.43 : 581.13 = 98.87 : x
  2. Step 2: Convert to fraction form
    387.43/581.13 = 98.87/x
  3. Step 3: Cross multiply
    387.43x = 581.13 × 98.87
  4. Step 4: Simplify right side
    387.43x = 57,453.42
  5. Step 5: Solve for x
    x = 57,453.42/387.43
  6. Step 6: Final answer
    x = 148.29

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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.