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Finding the Fourth Proportional to 79.98, 120.43 and 69.95

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Solution

The fourth proportional to 79.98, 120.43 and 69.95 is: 105.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.98 : 120.43 = 69.95 : x
  2. Step 2: Convert to fraction form
    79.98/120.43 = 69.95/x
  3. Step 3: Cross multiply
    79.98x = 120.43 × 69.95
  4. Step 4: Simplify right side
    79.98x = 8,424.08
  5. Step 5: Solve for x
    x = 8,424.08/79.98
  6. Step 6: Final answer
    x = 105.33

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.