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Finding the Fourth Proportional to 387.96, 582.16 and 171.70

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Solution

The fourth proportional to 387.96, 582.16 and 171.70 is: 257.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.96 : 582.16 = 171.70 : x
  2. Step 2: Convert to fraction form
    387.96/582.16 = 171.70/x
  3. Step 3: Cross multiply
    387.96x = 582.16 × 171.70
  4. Step 4: Simplify right side
    387.96x = 99,956.87
  5. Step 5: Solve for x
    x = 99,956.87/387.96
  6. Step 6: Final answer
    x = 257.65

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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.