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Finding the Fourth Proportional to 79.53, 109.81 and 51.90

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Solution

The fourth proportional to 79.53, 109.81 and 51.90 is: 71.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.53 : 109.81 = 51.90 : x
  2. Step 2: Convert to fraction form
    79.53/109.81 = 51.90/x
  3. Step 3: Cross multiply
    79.53x = 109.81 × 51.90
  4. Step 4: Simplify right side
    79.53x = 5,698.59
  5. Step 5: Solve for x
    x = 5,698.59/79.53
  6. Step 6: Final answer
    x = 71.66

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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.