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Finding the Fourth Proportional to 79.91, 119.83 and 64.65

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Solution

The fourth proportional to 79.91, 119.83 and 64.65 is: 96.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.91 : 119.83 = 64.65 : x
  2. Step 2: Convert to fraction form
    79.91/119.83 = 64.65/x
  3. Step 3: Cross multiply
    79.91x = 119.83 × 64.65
  4. Step 4: Simplify right side
    79.91x = 7,746.74
  5. Step 5: Solve for x
    x = 7,746.74/79.91
  6. Step 6: Final answer
    x = 96.94

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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.