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Finding the Fourth Proportional to 884.79, 1,220.27 and 672.80

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Solution

The fourth proportional to 884.79, 1,220.27 and 672.80 is: 927.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.79 : 1,220.27 = 672.80 : x
  2. Step 2: Convert to fraction form
    884.79/1,220.27 = 672.80/x
  3. Step 3: Cross multiply
    884.79x = 1,220.27 × 672.80
  4. Step 4: Simplify right side
    884.79x = 820,988.19
  5. Step 5: Solve for x
    x = 820,988.19/884.79
  6. Step 6: Final answer
    x = 927.89

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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.