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Finding the Fourth Proportional to 721.12, 1,081.91 and 227.51

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Solution

The fourth proportional to 721.12, 1,081.91 and 227.51 is: 341.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.12 : 1,081.91 = 227.51 : x
  2. Step 2: Convert to fraction form
    721.12/1,081.91 = 227.51/x
  3. Step 3: Cross multiply
    721.12x = 1,081.91 × 227.51
  4. Step 4: Simplify right side
    721.12x = 246,145.34
  5. Step 5: Solve for x
    x = 246,145.34/721.12
  6. Step 6: Final answer
    x = 341.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.