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Finding the Fourth Proportional to 940.27, 1,409.20 and 689.80

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Solution

The fourth proportional to 940.27, 1,409.20 and 689.80 is: 1,033.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.27 : 1,409.20 = 689.80 : x
  2. Step 2: Convert to fraction form
    940.27/1,409.20 = 689.80/x
  3. Step 3: Cross multiply
    940.27x = 1,409.20 × 689.80
  4. Step 4: Simplify right side
    940.27x = 972,066.16
  5. Step 5: Solve for x
    x = 972,066.16/940.27
  6. Step 6: Final answer
    x = 1,033.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.