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Finding the Fourth Proportional to 138.47, 190.43 and 110.79

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Solution

The fourth proportional to 138.47, 190.43 and 110.79 is: 152.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.47 : 190.43 = 110.79 : x
  2. Step 2: Convert to fraction form
    138.47/190.43 = 110.79/x
  3. Step 3: Cross multiply
    138.47x = 190.43 × 110.79
  4. Step 4: Simplify right side
    138.47x = 21,098.76
  5. Step 5: Solve for x
    x = 21,098.76/138.47
  6. Step 6: Final answer
    x = 152.37

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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.