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Finding the Fourth Proportional to 1,245.29, 1,718.31 and 721.22

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Solution

The fourth proportional to 1,245.29, 1,718.31 and 721.22 is: 995.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.29 : 1,718.31 = 721.22 : x
  2. Step 2: Convert to fraction form
    1,245.29/1,718.31 = 721.22/x
  3. Step 3: Cross multiply
    1,245.29x = 1,718.31 × 721.22
  4. Step 4: Simplify right side
    1,245.29x = 1,239,270.95
  5. Step 5: Solve for x
    x = 1,239,270.95/1,245.29
  6. Step 6: Final answer
    x = 995.17

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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.