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Finding the Fourth Proportional to 387.60, 581.46 and 171.19

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Solution

The fourth proportional to 387.60, 581.46 and 171.19 is: 256.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.60 : 581.46 = 171.19 : x
  2. Step 2: Convert to fraction form
    387.60/581.46 = 171.19/x
  3. Step 3: Cross multiply
    387.60x = 581.46 × 171.19
  4. Step 4: Simplify right side
    387.60x = 99,540.14
  5. Step 5: Solve for x
    x = 99,540.14/387.60
  6. Step 6: Final answer
    x = 256.81

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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.