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Finding the Fourth Proportional to 1,245.33, 1,717.88 and 721.26

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Solution

The fourth proportional to 1,245.33, 1,717.88 and 721.26 is: 994.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.33 : 1,717.88 = 721.26 : x
  2. Step 2: Convert to fraction form
    1,245.33/1,717.88 = 721.26/x
  3. Step 3: Cross multiply
    1,245.33x = 1,717.88 × 721.26
  4. Step 4: Simplify right side
    1,245.33x = 1,239,034.52
  5. Step 5: Solve for x
    x = 1,239,034.52/1,245.33
  6. Step 6: Final answer
    x = 994.94

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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.