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Finding the Fourth Proportional to 79.45, 119.08 and 78.59

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Solution

The fourth proportional to 79.45, 119.08 and 78.59 is: 117.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.45 : 119.08 = 78.59 : x
  2. Step 2: Convert to fraction form
    79.45/119.08 = 78.59/x
  3. Step 3: Cross multiply
    79.45x = 119.08 × 78.59
  4. Step 4: Simplify right side
    79.45x = 9,358.50
  5. Step 5: Solve for x
    x = 9,358.50/79.45
  6. Step 6: Final answer
    x = 117.80

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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.