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Finding the Fourth Proportional to 78.36, 118.22 and 70.44

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Solution

The fourth proportional to 78.36, 118.22 and 70.44 is: 106.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.36 : 118.22 = 70.44 : x
  2. Step 2: Convert to fraction form
    78.36/118.22 = 70.44/x
  3. Step 3: Cross multiply
    78.36x = 118.22 × 70.44
  4. Step 4: Simplify right side
    78.36x = 8,327.42
  5. Step 5: Solve for x
    x = 8,327.42/78.36
  6. Step 6: Final answer
    x = 106.27

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.