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Finding the Fourth Proportional to 150.40, 207.40 and 122.72

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Solution

The fourth proportional to 150.40, 207.40 and 122.72 is: 169.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.40 : 207.40 = 122.72 : x
  2. Step 2: Convert to fraction form
    150.40/207.40 = 122.72/x
  3. Step 3: Cross multiply
    150.40x = 207.40 × 122.72
  4. Step 4: Simplify right side
    150.40x = 25,452.13
  5. Step 5: Solve for x
    x = 25,452.13/150.40
  6. Step 6: Final answer
    x = 169.23

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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.