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Finding the Fourth Proportional to 88.76, 121.94 and 79.98

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Solution

The fourth proportional to 88.76, 121.94 and 79.98 is: 109.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.76 : 121.94 = 79.98 : x
  2. Step 2: Convert to fraction form
    88.76/121.94 = 79.98/x
  3. Step 3: Cross multiply
    88.76x = 121.94 × 79.98
  4. Step 4: Simplify right side
    88.76x = 9,752.36
  5. Step 5: Solve for x
    x = 9,752.36/88.76
  6. Step 6: Final answer
    x = 109.88

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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.