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Finding the Fourth Proportional to 79.00, 108.99 and 47.90

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Solution

The fourth proportional to 79.00, 108.99 and 47.90 is: 66.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.00 : 108.99 = 47.90 : x
  2. Step 2: Convert to fraction form
    79.00/108.99 = 47.90/x
  3. Step 3: Cross multiply
    79.00x = 108.99 × 47.90
  4. Step 4: Simplify right side
    79.00x = 5,220.08
  5. Step 5: Solve for x
    x = 5,220.08/79.00
  6. Step 6: Final answer
    x = 66.08

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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.