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Finding the Fourth Proportional to 90.17, 135.03 and 72.08

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Solution

The fourth proportional to 90.17, 135.03 and 72.08 is: 107.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.17 : 135.03 = 72.08 : x
  2. Step 2: Convert to fraction form
    90.17/135.03 = 72.08/x
  3. Step 3: Cross multiply
    90.17x = 135.03 × 72.08
  4. Step 4: Simplify right side
    90.17x = 9,732.96
  5. Step 5: Solve for x
    x = 9,732.96/90.17
  6. Step 6: Final answer
    x = 107.94

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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.