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Finding the Fourth Proportional to 1,073.68, 1,481.44 and 681.20

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Solution

The fourth proportional to 1,073.68, 1,481.44 and 681.20 is: 939.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.68 : 1,481.44 = 681.20 : x
  2. Step 2: Convert to fraction form
    1,073.68/1,481.44 = 681.20/x
  3. Step 3: Cross multiply
    1,073.68x = 1,481.44 × 681.20
  4. Step 4: Simplify right side
    1,073.68x = 1,009,156.93
  5. Step 5: Solve for x
    x = 1,009,156.93/1,073.68
  6. Step 6: Final answer
    x = 939.90

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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.