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Finding the Fourth Proportional to 872.76, 1,309.19 and 256.56

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Solution

The fourth proportional to 872.76, 1,309.19 and 256.56 is: 384.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.76 : 1,309.19 = 256.56 : x
  2. Step 2: Convert to fraction form
    872.76/1,309.19 = 256.56/x
  3. Step 3: Cross multiply
    872.76x = 1,309.19 × 256.56
  4. Step 4: Simplify right side
    872.76x = 335,885.79
  5. Step 5: Solve for x
    x = 335,885.79/872.76
  6. Step 6: Final answer
    x = 384.85

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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.