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Finding the Fourth Proportional to 872.95, 1,309.34 and 287.94

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Solution

The fourth proportional to 872.95, 1,309.34 and 287.94 is: 431.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.95 : 1,309.34 = 287.94 : x
  2. Step 2: Convert to fraction form
    872.95/1,309.34 = 287.94/x
  3. Step 3: Cross multiply
    872.95x = 1,309.34 × 287.94
  4. Step 4: Simplify right side
    872.95x = 377,011.36
  5. Step 5: Solve for x
    x = 377,011.36/872.95
  6. Step 6: Final answer
    x = 431.88

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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.