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Finding the Fourth Proportional to 79.84, 120.12 and 72.34

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Solution

The fourth proportional to 79.84, 120.12 and 72.34 is: 108.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.84 : 120.12 = 72.34 : x
  2. Step 2: Convert to fraction form
    79.84/120.12 = 72.34/x
  3. Step 3: Cross multiply
    79.84x = 120.12 × 72.34
  4. Step 4: Simplify right side
    79.84x = 8,689.48
  5. Step 5: Solve for x
    x = 8,689.48/79.84
  6. Step 6: Final answer
    x = 108.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.