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Finding the Fourth Proportional to 79.69, 109.75 and 68.77

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Solution

The fourth proportional to 79.69, 109.75 and 68.77 is: 94.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.69 : 109.75 = 68.77 : x
  2. Step 2: Convert to fraction form
    79.69/109.75 = 68.77/x
  3. Step 3: Cross multiply
    79.69x = 109.75 × 68.77
  4. Step 4: Simplify right side
    79.69x = 7,547.51
  5. Step 5: Solve for x
    x = 7,547.51/79.69
  6. Step 6: Final answer
    x = 94.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.