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Finding the Fourth Proportional to 109.40, 164.21 and 61.34

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Solution

The fourth proportional to 109.40, 164.21 and 61.34 is: 92.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.40 : 164.21 = 61.34 : x
  2. Step 2: Convert to fraction form
    109.40/164.21 = 61.34/x
  3. Step 3: Cross multiply
    109.40x = 164.21 × 61.34
  4. Step 4: Simplify right side
    109.40x = 10,071.51
  5. Step 5: Solve for x
    x = 10,071.51/109.40
  6. Step 6: Final answer
    x = 92.07

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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.