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Finding the Fourth Proportional to 78.11, 107.68 and 59.59

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Solution

The fourth proportional to 78.11, 107.68 and 59.59 is: 82.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.11 : 107.68 = 59.59 : x
  2. Step 2: Convert to fraction form
    78.11/107.68 = 59.59/x
  3. Step 3: Cross multiply
    78.11x = 107.68 × 59.59
  4. Step 4: Simplify right side
    78.11x = 6,416.65
  5. Step 5: Solve for x
    x = 6,416.65/78.11
  6. Step 6: Final answer
    x = 82.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.