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Finding the Fourth Proportional to 910.44, 1,255.40 and 721.81

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Solution

The fourth proportional to 910.44, 1,255.40 and 721.81 is: 995.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.44 : 1,255.40 = 721.81 : x
  2. Step 2: Convert to fraction form
    910.44/1,255.40 = 721.81/x
  3. Step 3: Cross multiply
    910.44x = 1,255.40 × 721.81
  4. Step 4: Simplify right side
    910.44x = 906,160.94
  5. Step 5: Solve for x
    x = 906,160.94/910.44
  6. Step 6: Final answer
    x = 995.30

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Double scale
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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.