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Finding the Fourth Proportional to 126.36, 189.48 and 78.22

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Solution

The fourth proportional to 126.36, 189.48 and 78.22 is: 117.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.36 : 189.48 = 78.22 : x
  2. Step 2: Convert to fraction form
    126.36/189.48 = 78.22/x
  3. Step 3: Cross multiply
    126.36x = 189.48 × 78.22
  4. Step 4: Simplify right side
    126.36x = 14,821.13
  5. Step 5: Solve for x
    x = 14,821.13/126.36
  6. Step 6: Final answer
    x = 117.29

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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.