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Finding the Fourth Proportional to 107.28, 147.96 and 90.96

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Solution

The fourth proportional to 107.28, 147.96 and 90.96 is: 125.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.28 : 147.96 = 90.96 : x
  2. Step 2: Convert to fraction form
    107.28/147.96 = 90.96/x
  3. Step 3: Cross multiply
    107.28x = 147.96 × 90.96
  4. Step 4: Simplify right side
    107.28x = 13,458.44
  5. Step 5: Solve for x
    x = 13,458.44/107.28
  6. Step 6: Final answer
    x = 125.45

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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.