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Finding the Fourth Proportional to 916.32, 1,375.04 and 821.28

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Solution

The fourth proportional to 916.32, 1,375.04 and 821.28 is: 1,232.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.32 : 1,375.04 = 821.28 : x
  2. Step 2: Convert to fraction form
    916.32/1,375.04 = 821.28/x
  3. Step 3: Cross multiply
    916.32x = 1,375.04 × 821.28
  4. Step 4: Simplify right side
    916.32x = 1,129,292.85
  5. Step 5: Solve for x
    x = 1,129,292.85/916.32
  6. Step 6: Final answer
    x = 1,232.42

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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.