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Finding the Fourth Proportional to 107.89, 162.48 and 90.88

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Solution

The fourth proportional to 107.89, 162.48 and 90.88 is: 136.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.89 : 162.48 = 90.88 : x
  2. Step 2: Convert to fraction form
    107.89/162.48 = 90.88/x
  3. Step 3: Cross multiply
    107.89x = 162.48 × 90.88
  4. Step 4: Simplify right side
    107.89x = 14,766.18
  5. Step 5: Solve for x
    x = 14,766.18/107.89
  6. Step 6: Final answer
    x = 136.86

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.