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Finding the Fourth Proportional to 1,079.60, 1,489.41 and 681.13

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Solution

The fourth proportional to 1,079.60, 1,489.41 and 681.13 is: 939.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.60 : 1,489.41 = 681.13 : x
  2. Step 2: Convert to fraction form
    1,079.60/1,489.41 = 681.13/x
  3. Step 3: Cross multiply
    1,079.60x = 1,489.41 × 681.13
  4. Step 4: Simplify right side
    1,079.60x = 1,014,485.49
  5. Step 5: Solve for x
    x = 1,014,485.49/1,079.60
  6. Step 6: Final answer
    x = 939.68

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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.