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Finding the Fourth Proportional to 740, 1,022.40 and 667.20

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Solution

The fourth proportional to 740, 1,022.40 and 667.20 is: 921.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    740 : 1,022.40 = 667.20 : x
  2. Step 2: Convert to fraction form
    740/1,022.40 = 667.20/x
  3. Step 3: Cross multiply
    740x = 1,022.40 × 667.20
  4. Step 4: Simplify right side
    740x = 682,145.28
  5. Step 5: Solve for x
    x = 682,145.28/740
  6. Step 6: Final answer
    x = 921.82

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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.