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Finding the Fourth Proportional to 721.09, 1,081.53 and 234.08

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Solution

The fourth proportional to 721.09, 1,081.53 and 234.08 is: 351.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.09 : 1,081.53 = 234.08 : x
  2. Step 2: Convert to fraction form
    721.09/1,081.53 = 234.08/x
  3. Step 3: Cross multiply
    721.09x = 1,081.53 × 234.08
  4. Step 4: Simplify right side
    721.09x = 253,159.13
  5. Step 5: Solve for x
    x = 253,159.13/721.09
  6. Step 6: Final answer
    x = 351.08

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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.