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Finding the Fourth Proportional to 79.08, 109.13 and 47.99

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Solution

The fourth proportional to 79.08, 109.13 and 47.99 is: 66.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.08 : 109.13 = 47.99 : x
  2. Step 2: Convert to fraction form
    79.08/109.13 = 47.99/x
  3. Step 3: Cross multiply
    79.08x = 109.13 × 47.99
  4. Step 4: Simplify right side
    79.08x = 5,237.84
  5. Step 5: Solve for x
    x = 5,237.84/79.08
  6. Step 6: Final answer
    x = 66.23

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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.