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Finding the Fourth Proportional to 107.76, 148.56 and 91.32

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Solution

The fourth proportional to 107.76, 148.56 and 91.32 is: 125.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.76 : 148.56 = 91.32 : x
  2. Step 2: Convert to fraction form
    107.76/148.56 = 91.32/x
  3. Step 3: Cross multiply
    107.76x = 148.56 × 91.32
  4. Step 4: Simplify right side
    107.76x = 13,566.50
  5. Step 5: Solve for x
    x = 13,566.50/107.76
  6. Step 6: Final answer
    x = 125.90

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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.