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Finding the Fourth Proportional to 109.76, 164.39 and 90.45

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Solution

The fourth proportional to 109.76, 164.39 and 90.45 is: 135.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.76 : 164.39 = 90.45 : x
  2. Step 2: Convert to fraction form
    109.76/164.39 = 90.45/x
  3. Step 3: Cross multiply
    109.76x = 164.39 × 90.45
  4. Step 4: Simplify right side
    109.76x = 14,868.62
  5. Step 5: Solve for x
    x = 14,868.62/109.76
  6. Step 6: Final answer
    x = 135.47

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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.