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Finding the Fourth Proportional to 884.85, 1,220.80 and 511.78

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Solution

The fourth proportional to 884.85, 1,220.80 and 511.78 is: 706.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.85 : 1,220.80 = 511.78 : x
  2. Step 2: Convert to fraction form
    884.85/1,220.80 = 511.78/x
  3. Step 3: Cross multiply
    884.85x = 1,220.80 × 511.78
  4. Step 4: Simplify right side
    884.85x = 624,781.02
  5. Step 5: Solve for x
    x = 624,781.02/884.85
  6. Step 6: Final answer
    x = 706.09

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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.