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Finding the Fourth Proportional to 387.65, 581.10 and 170.96

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Solution

The fourth proportional to 387.65, 581.10 and 170.96 is: 256.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.65 : 581.10 = 170.96 : x
  2. Step 2: Convert to fraction form
    387.65/581.10 = 170.96/x
  3. Step 3: Cross multiply
    387.65x = 581.10 × 170.96
  4. Step 4: Simplify right side
    387.65x = 99,344.86
  5. Step 5: Solve for x
    x = 99,344.86/387.65
  6. Step 6: Final answer
    x = 256.27

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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.