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Finding the Fourth Proportional to 79.24, 109.78 and 77.35

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Solution

The fourth proportional to 79.24, 109.78 and 77.35 is: 107.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.24 : 109.78 = 77.35 : x
  2. Step 2: Convert to fraction form
    79.24/109.78 = 77.35/x
  3. Step 3: Cross multiply
    79.24x = 109.78 × 77.35
  4. Step 4: Simplify right side
    79.24x = 8,491.10
  5. Step 5: Solve for x
    x = 8,491.10/79.24
  6. Step 6: Final answer
    x = 107.16

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.