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Finding the Fourth Proportional to 888.80, 1,226.64 and 640.92

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Solution

The fourth proportional to 888.80, 1,226.64 and 640.92 is: 884.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.80 : 1,226.64 = 640.92 : x
  2. Step 2: Convert to fraction form
    888.80/1,226.64 = 640.92/x
  3. Step 3: Cross multiply
    888.80x = 1,226.64 × 640.92
  4. Step 4: Simplify right side
    888.80x = 786,178.11
  5. Step 5: Solve for x
    x = 786,178.11/888.80
  6. Step 6: Final answer
    x = 884.54

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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.