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Finding the Fourth Proportional to 876.44, 1,315.02 and 862.64

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Solution

The fourth proportional to 876.44, 1,315.02 and 862.64 is: 1,294.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.44 : 1,315.02 = 862.64 : x
  2. Step 2: Convert to fraction form
    876.44/1,315.02 = 862.64/x
  3. Step 3: Cross multiply
    876.44x = 1,315.02 × 862.64
  4. Step 4: Simplify right side
    876.44x = 1,134,388.85
  5. Step 5: Solve for x
    x = 1,134,388.85/876.44
  6. Step 6: Final answer
    x = 1,294.31

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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.