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Finding the Fourth Proportional to 110.99, 165.86 and 90.72

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Solution

The fourth proportional to 110.99, 165.86 and 90.72 is: 135.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.99 : 165.86 = 90.72 : x
  2. Step 2: Convert to fraction form
    110.99/165.86 = 90.72/x
  3. Step 3: Cross multiply
    110.99x = 165.86 × 90.72
  4. Step 4: Simplify right side
    110.99x = 15,046.37
  5. Step 5: Solve for x
    x = 15,046.37/110.99
  6. Step 6: Final answer
    x = 135.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.