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Finding the Fourth Proportional to 90.06, 134.84 and 71.69

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Solution

The fourth proportional to 90.06, 134.84 and 71.69 is: 107.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.06 : 134.84 = 71.69 : x
  2. Step 2: Convert to fraction form
    90.06/134.84 = 71.69/x
  3. Step 3: Cross multiply
    90.06x = 134.84 × 71.69
  4. Step 4: Simplify right side
    90.06x = 9,667.20
  5. Step 5: Solve for x
    x = 9,667.20/90.06
  6. Step 6: Final answer
    x = 107.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.