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Finding the Fourth Proportional to 1,208.92, 1,810.84 and 721.71

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Solution

The fourth proportional to 1,208.92, 1,810.84 and 721.71 is: 1,081.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.92 : 1,810.84 = 721.71 : x
  2. Step 2: Convert to fraction form
    1,208.92/1,810.84 = 721.71/x
  3. Step 3: Cross multiply
    1,208.92x = 1,810.84 × 721.71
  4. Step 4: Simplify right side
    1,208.92x = 1,306,901.34
  5. Step 5: Solve for x
    x = 1,306,901.34/1,208.92
  6. Step 6: Final answer
    x = 1,081.05

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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.