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Finding the Fourth Proportional to 387.53, 581.28 and 98.96

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Solution

The fourth proportional to 387.53, 581.28 and 98.96 is: 148.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.53 : 581.28 = 98.96 : x
  2. Step 2: Convert to fraction form
    387.53/581.28 = 98.96/x
  3. Step 3: Cross multiply
    387.53x = 581.28 × 98.96
  4. Step 4: Simplify right side
    387.53x = 57,520.56
  5. Step 5: Solve for x
    x = 57,520.56/387.53
  6. Step 6: Final answer
    x = 148.43

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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.