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Finding the Fourth Proportional to 887.85, 1,224.18 and 721.80

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Solution

The fourth proportional to 887.85, 1,224.18 and 721.80 is: 995.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.85 : 1,224.18 = 721.80 : x
  2. Step 2: Convert to fraction form
    887.85/1,224.18 = 721.80/x
  3. Step 3: Cross multiply
    887.85x = 1,224.18 × 721.80
  4. Step 4: Simplify right side
    887.85x = 883,613.12
  5. Step 5: Solve for x
    x = 883,613.12/887.85
  6. Step 6: Final answer
    x = 995.23

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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.