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Finding the Fourth Proportional to 107.78, 148.97 and 99.27

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Solution

The fourth proportional to 107.78, 148.97 and 99.27 is: 137.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.78 : 148.97 = 99.27 : x
  2. Step 2: Convert to fraction form
    107.78/148.97 = 99.27/x
  3. Step 3: Cross multiply
    107.78x = 148.97 × 99.27
  4. Step 4: Simplify right side
    107.78x = 14,788.50
  5. Step 5: Solve for x
    x = 14,788.50/107.78
  6. Step 6: Final answer
    x = 137.22

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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.