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Finding the Fourth Proportional to 107.79, 148.80 and 91.18

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Solution

The fourth proportional to 107.79, 148.80 and 91.18 is: 125.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.79 : 148.80 = 91.18 : x
  2. Step 2: Convert to fraction form
    107.79/148.80 = 91.18/x
  3. Step 3: Cross multiply
    107.79x = 148.80 × 91.18
  4. Step 4: Simplify right side
    107.79x = 13,567.58
  5. Step 5: Solve for x
    x = 13,567.58/107.79
  6. Step 6: Final answer
    x = 125.88

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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.