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Finding the Fourth Proportional to 73.18, 109.12 and 68.22

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Solution

The fourth proportional to 73.18, 109.12 and 68.22 is: 101.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.18 : 109.12 = 68.22 : x
  2. Step 2: Convert to fraction form
    73.18/109.12 = 68.22/x
  3. Step 3: Cross multiply
    73.18x = 109.12 × 68.22
  4. Step 4: Simplify right side
    73.18x = 7,443.79
  5. Step 5: Solve for x
    x = 7,443.79/73.18
  6. Step 6: Final answer
    x = 101.72

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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.