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Finding the Fourth Proportional to 149.12, 222.40 and 140.32

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Solution

The fourth proportional to 149.12, 222.40 and 140.32 is: 209.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.12 : 222.40 = 140.32 : x
  2. Step 2: Convert to fraction form
    149.12/222.40 = 140.32/x
  3. Step 3: Cross multiply
    149.12x = 222.40 × 140.32
  4. Step 4: Simplify right side
    149.12x = 31,207.17
  5. Step 5: Solve for x
    x = 31,207.17/149.12
  6. Step 6: Final answer
    x = 209.28

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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.