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Finding the Fourth Proportional to 79.11, 118.50 and 61.05

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Solution

The fourth proportional to 79.11, 118.50 and 61.05 is: 91.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.11 : 118.50 = 61.05 : x
  2. Step 2: Convert to fraction form
    79.11/118.50 = 61.05/x
  3. Step 3: Cross multiply
    79.11x = 118.50 × 61.05
  4. Step 4: Simplify right side
    79.11x = 7,234.64
  5. Step 5: Solve for x
    x = 7,234.64/79.11
  6. Step 6: Final answer
    x = 91.45

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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.