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Finding the Fourth Proportional to 853.44, 1,177.52 and 721.20

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Solution

The fourth proportional to 853.44, 1,177.52 and 721.20 is: 995.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.44 : 1,177.52 = 721.20 : x
  2. Step 2: Convert to fraction form
    853.44/1,177.52 = 721.20/x
  3. Step 3: Cross multiply
    853.44x = 1,177.52 × 721.20
  4. Step 4: Simplify right side
    853.44x = 849,227.42
  5. Step 5: Solve for x
    x = 849,227.42/853.44
  6. Step 6: Final answer
    x = 995.06

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1.5x scale

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.