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Finding the Fourth Proportional to 79.18, 119.36 and 72.35

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Solution

The fourth proportional to 79.18, 119.36 and 72.35 is: 109.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.18 : 119.36 = 72.35 : x
  2. Step 2: Convert to fraction form
    79.18/119.36 = 72.35/x
  3. Step 3: Cross multiply
    79.18x = 119.36 × 72.35
  4. Step 4: Simplify right side
    79.18x = 8,634.74
  5. Step 5: Solve for x
    x = 8,634.74/79.18
  6. Step 6: Final answer
    x = 109.05

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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.