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Finding the Fourth Proportional to 888.79, 1,225.61 and 641.29

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Solution

The fourth proportional to 888.79, 1,225.61 and 641.29 is: 884.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.79 : 1,225.61 = 641.29 : x
  2. Step 2: Convert to fraction form
    888.79/1,225.61 = 641.29/x
  3. Step 3: Cross multiply
    888.79x = 1,225.61 × 641.29
  4. Step 4: Simplify right side
    888.79x = 785,968.23
  5. Step 5: Solve for x
    x = 785,968.23/888.79
  6. Step 6: Final answer
    x = 884.31

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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.