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Finding the Fourth Proportional to 1,281.43, 1,768.40 and 721.89

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Solution

The fourth proportional to 1,281.43, 1,768.40 and 721.89 is: 996.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.43 : 1,768.40 = 721.89 : x
  2. Step 2: Convert to fraction form
    1,281.43/1,768.40 = 721.89/x
  3. Step 3: Cross multiply
    1,281.43x = 1,768.40 × 721.89
  4. Step 4: Simplify right side
    1,281.43x = 1,276,590.28
  5. Step 5: Solve for x
    x = 1,276,590.28/1,281.43
  6. Step 6: Final answer
    x = 996.22

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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.