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Finding the Fourth Proportional to 75.58, 113.39 and 68.86

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Solution

The fourth proportional to 75.58, 113.39 and 68.86 is: 103.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.58 : 113.39 = 68.86 : x
  2. Step 2: Convert to fraction form
    75.58/113.39 = 68.86/x
  3. Step 3: Cross multiply
    75.58x = 113.39 × 68.86
  4. Step 4: Simplify right side
    75.58x = 7,808.04
  5. Step 5: Solve for x
    x = 7,808.04/75.58
  6. Step 6: Final answer
    x = 103.31

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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.