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Finding the Fourth Proportional to 150.45, 207.57 and 91.42

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Solution

The fourth proportional to 150.45, 207.57 and 91.42 is: 126.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.45 : 207.57 = 91.42 : x
  2. Step 2: Convert to fraction form
    150.45/207.57 = 91.42/x
  3. Step 3: Cross multiply
    150.45x = 207.57 × 91.42
  4. Step 4: Simplify right side
    150.45x = 18,975.55
  5. Step 5: Solve for x
    x = 18,975.55/150.45
  6. Step 6: Final answer
    x = 126.12

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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.