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Finding the Fourth Proportional to 740.28, 1,104.36 and 661.92

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Solution

The fourth proportional to 740.28, 1,104.36 and 661.92 is: 987.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.28 : 1,104.36 = 661.92 : x
  2. Step 2: Convert to fraction form
    740.28/1,104.36 = 661.92/x
  3. Step 3: Cross multiply
    740.28x = 1,104.36 × 661.92
  4. Step 4: Simplify right side
    740.28x = 730,997.97
  5. Step 5: Solve for x
    x = 730,997.97/740.28
  6. Step 6: Final answer
    x = 987.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.