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Finding the Fourth Proportional to 1,079.67, 1,490.36 and 681.30

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Solution

The fourth proportional to 1,079.67, 1,490.36 and 681.30 is: 940.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.67 : 1,490.36 = 681.30 : x
  2. Step 2: Convert to fraction form
    1,079.67/1,490.36 = 681.30/x
  3. Step 3: Cross multiply
    1,079.67x = 1,490.36 × 681.30
  4. Step 4: Simplify right side
    1,079.67x = 1,015,382.27
  5. Step 5: Solve for x
    x = 1,015,382.27/1,079.67
  6. Step 6: Final answer
    x = 940.46

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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.