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Finding the Fourth Proportional to 876.45, 1,315.80 and 872.49

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Solution

The fourth proportional to 876.45, 1,315.80 and 872.49 is: 1,309.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.45 : 1,315.80 = 872.49 : x
  2. Step 2: Convert to fraction form
    876.45/1,315.80 = 872.49/x
  3. Step 3: Cross multiply
    876.45x = 1,315.80 × 872.49
  4. Step 4: Simplify right side
    876.45x = 1,148,022.34
  5. Step 5: Solve for x
    x = 1,148,022.34/876.45
  6. Step 6: Final answer
    x = 1,309.85

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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.