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Finding the Fourth Proportional to 387.81, 581.72 and 99.24

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Solution

The fourth proportional to 387.81, 581.72 and 99.24 is: 148.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.81 : 581.72 = 99.24 : x
  2. Step 2: Convert to fraction form
    387.81/581.72 = 99.24/x
  3. Step 3: Cross multiply
    387.81x = 581.72 × 99.24
  4. Step 4: Simplify right side
    387.81x = 57,731.35
  5. Step 5: Solve for x
    x = 57,731.35/387.81
  6. Step 6: Final answer
    x = 148.87

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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.