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Finding the Fourth Proportional to 1,260.18, 1,739 and 721.79

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Solution

The fourth proportional to 1,260.18, 1,739 and 721.79 is: 996.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.18 : 1,739 = 721.79 : x
  2. Step 2: Convert to fraction form
    1,260.18/1,739 = 721.79/x
  3. Step 3: Cross multiply
    1,260.18x = 1,739 × 721.79
  4. Step 4: Simplify right side
    1,260.18x = 1,255,192.81
  5. Step 5: Solve for x
    x = 1,255,192.81/1,260.18
  6. Step 6: Final answer
    x = 996.05

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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.