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Finding the Fourth Proportional to 387.62, 581.28 and 171.05

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Solution

The fourth proportional to 387.62, 581.28 and 171.05 is: 256.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.62 : 581.28 = 171.05 : x
  2. Step 2: Convert to fraction form
    387.62/581.28 = 171.05/x
  3. Step 3: Cross multiply
    387.62x = 581.28 × 171.05
  4. Step 4: Simplify right side
    387.62x = 99,425.81
  5. Step 5: Solve for x
    x = 99,425.81/387.62
  6. Step 6: Final answer
    x = 256.50

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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.