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Finding the Fourth Proportional to 75.99, 113.43 and 69.58

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Solution

The fourth proportional to 75.99, 113.43 and 69.58 is: 103.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.99 : 113.43 = 69.58 : x
  2. Step 2: Convert to fraction form
    75.99/113.43 = 69.58/x
  3. Step 3: Cross multiply
    75.99x = 113.43 × 69.58
  4. Step 4: Simplify right side
    75.99x = 7,891.91
  5. Step 5: Solve for x
    x = 7,891.91/75.99
  6. Step 6: Final answer
    x = 103.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.