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Finding the Fourth Proportional to 149.40, 222.75 and 138.87

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Solution

The fourth proportional to 149.40, 222.75 and 138.87 is: 207.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.40 : 222.75 = 138.87 : x
  2. Step 2: Convert to fraction form
    149.40/222.75 = 138.87/x
  3. Step 3: Cross multiply
    149.40x = 222.75 × 138.87
  4. Step 4: Simplify right side
    149.40x = 30,933.29
  5. Step 5: Solve for x
    x = 30,933.29/149.40
  6. Step 6: Final answer
    x = 207.05

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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.