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Finding the Fourth Proportional to 78.88, 108.26 and 70.96

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Solution

The fourth proportional to 78.88, 108.26 and 70.96 is: 97.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.88 : 108.26 = 70.96 : x
  2. Step 2: Convert to fraction form
    78.88/108.26 = 70.96/x
  3. Step 3: Cross multiply
    78.88x = 108.26 × 70.96
  4. Step 4: Simplify right side
    78.88x = 7,682.13
  5. Step 5: Solve for x
    x = 7,682.13/78.88
  6. Step 6: Final answer
    x = 97.39

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.