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Finding the Fourth Proportional to 888.20, 1,225.80 and 663.75

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Solution

The fourth proportional to 888.20, 1,225.80 and 663.75 is: 916.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.20 : 1,225.80 = 663.75 : x
  2. Step 2: Convert to fraction form
    888.20/1,225.80 = 663.75/x
  3. Step 3: Cross multiply
    888.20x = 1,225.80 × 663.75
  4. Step 4: Simplify right side
    888.20x = 813,622.64
  5. Step 5: Solve for x
    x = 813,622.64/888.20
  6. Step 6: Final answer
    x = 916.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.