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Finding the Fourth Proportional to 910.43, 1,255.39 and 721.06

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Solution

The fourth proportional to 910.43, 1,255.39 and 721.06 is: 994.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.43 : 1,255.39 = 721.06 : x
  2. Step 2: Convert to fraction form
    910.43/1,255.39 = 721.06/x
  3. Step 3: Cross multiply
    910.43x = 1,255.39 × 721.06
  4. Step 4: Simplify right side
    910.43x = 905,211.51
  5. Step 5: Solve for x
    x = 905,211.51/910.43
  6. Step 6: Final answer
    x = 994.27

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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.