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Finding the Fourth Proportional to 387.74, 581.81 and 257.83

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Solution

The fourth proportional to 387.74, 581.81 and 257.83 is: 386.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.74 : 581.81 = 257.83 : x
  2. Step 2: Convert to fraction form
    387.74/581.81 = 257.83/x
  3. Step 3: Cross multiply
    387.74x = 581.81 × 257.83
  4. Step 4: Simplify right side
    387.74x = 150,008.48
  5. Step 5: Solve for x
    x = 150,008.48/387.74
  6. Step 6: Final answer
    x = 386.88

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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.