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Finding the Fourth Proportional to 88.19, 121.02 and 79.98

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Solution

The fourth proportional to 88.19, 121.02 and 79.98 is: 109.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.19 : 121.02 = 79.98 : x
  2. Step 2: Convert to fraction form
    88.19/121.02 = 79.98/x
  3. Step 3: Cross multiply
    88.19x = 121.02 × 79.98
  4. Step 4: Simplify right side
    88.19x = 9,679.18
  5. Step 5: Solve for x
    x = 9,679.18/88.19
  6. Step 6: Final answer
    x = 109.75

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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.