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Finding the Fourth Proportional to 85.56, 117.38 and 78.26

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Solution

The fourth proportional to 85.56, 117.38 and 78.26 is: 107.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.56 : 117.38 = 78.26 : x
  2. Step 2: Convert to fraction form
    85.56/117.38 = 78.26/x
  3. Step 3: Cross multiply
    85.56x = 117.38 × 78.26
  4. Step 4: Simplify right side
    85.56x = 9,186.16
  5. Step 5: Solve for x
    x = 9,186.16/85.56
  6. Step 6: Final answer
    x = 107.37

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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.