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Finding the Fourth Proportional to 149.98, 223.81 and 142.69

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Solution

The fourth proportional to 149.98, 223.81 and 142.69 is: 212.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.98 : 223.81 = 142.69 : x
  2. Step 2: Convert to fraction form
    149.98/223.81 = 142.69/x
  3. Step 3: Cross multiply
    149.98x = 223.81 × 142.69
  4. Step 4: Simplify right side
    149.98x = 31,935.45
  5. Step 5: Solve for x
    x = 31,935.45/149.98
  6. Step 6: Final answer
    x = 212.93

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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.