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Finding the Fourth Proportional to 580.78, 871.19 and 256.07

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Solution

The fourth proportional to 580.78, 871.19 and 256.07 is: 384.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.78 : 871.19 = 256.07 : x
  2. Step 2: Convert to fraction form
    580.78/871.19 = 256.07/x
  3. Step 3: Cross multiply
    580.78x = 871.19 × 256.07
  4. Step 4: Simplify right side
    580.78x = 223,085.62
  5. Step 5: Solve for x
    x = 223,085.62/580.78
  6. Step 6: Final answer
    x = 384.11

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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.