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Finding the Fourth Proportional to 149.10, 223.95 and 91.38

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Solution

The fourth proportional to 149.10, 223.95 and 91.38 is: 137.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.10 : 223.95 = 91.38 : x
  2. Step 2: Convert to fraction form
    149.10/223.95 = 91.38/x
  3. Step 3: Cross multiply
    149.10x = 223.95 × 91.38
  4. Step 4: Simplify right side
    149.10x = 20,464.55
  5. Step 5: Solve for x
    x = 20,464.55/149.10
  6. Step 6: Final answer
    x = 137.25

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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.