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Finding the Fourth Proportional to 581.05, 871.89 and 256.38

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Solution

The fourth proportional to 581.05, 871.89 and 256.38 is: 384.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.05 : 871.89 = 256.38 : x
  2. Step 2: Convert to fraction form
    581.05/871.89 = 256.38/x
  3. Step 3: Cross multiply
    581.05x = 871.89 × 256.38
  4. Step 4: Simplify right side
    581.05x = 223,535.16
  5. Step 5: Solve for x
    x = 223,535.16/581.05
  6. Step 6: Final answer
    x = 384.71

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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.