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Finding the Fourth Proportional to 872.91, 1,309.49 and 256.66

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Solution

The fourth proportional to 872.91, 1,309.49 and 256.66 is: 385.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.91 : 1,309.49 = 256.66 : x
  2. Step 2: Convert to fraction form
    872.91/1,309.49 = 256.66/x
  3. Step 3: Cross multiply
    872.91x = 1,309.49 × 256.66
  4. Step 4: Simplify right side
    872.91x = 336,089.15
  5. Step 5: Solve for x
    x = 336,089.15/872.91
  6. Step 6: Final answer
    x = 385.02

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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.