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Finding the Fourth Proportional to 79.49, 109.74 and 51.87

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Solution

The fourth proportional to 79.49, 109.74 and 51.87 is: 71.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.49 : 109.74 = 51.87 : x
  2. Step 2: Convert to fraction form
    79.49/109.74 = 51.87/x
  3. Step 3: Cross multiply
    79.49x = 109.74 × 51.87
  4. Step 4: Simplify right side
    79.49x = 5,692.82
  5. Step 5: Solve for x
    x = 5,692.82/79.49
  6. Step 6: Final answer
    x = 71.61

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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.