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Finding the Fourth Proportional to 109.56, 164.40 and 66.84

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Solution

The fourth proportional to 109.56, 164.40 and 66.84 is: 100.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.56 : 164.40 = 66.84 : x
  2. Step 2: Convert to fraction form
    109.56/164.40 = 66.84/x
  3. Step 3: Cross multiply
    109.56x = 164.40 × 66.84
  4. Step 4: Simplify right side
    109.56x = 10,988.50
  5. Step 5: Solve for x
    x = 10,988.50/109.56
  6. Step 6: Final answer
    x = 100.30

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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.