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Finding the Fourth Proportional to 888.90, 1,226.43 and 640.86

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Solution

The fourth proportional to 888.90, 1,226.43 and 640.86 is: 884.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.90 : 1,226.43 = 640.86 : x
  2. Step 2: Convert to fraction form
    888.90/1,226.43 = 640.86/x
  3. Step 3: Cross multiply
    888.90x = 1,226.43 × 640.86
  4. Step 4: Simplify right side
    888.90x = 785,969.93
  5. Step 5: Solve for x
    x = 785,969.93/888.90
  6. Step 6: Final answer
    x = 884.21

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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.