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Finding the Fourth Proportional to 79.83, 120.27 and 66.60

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Solution

The fourth proportional to 79.83, 120.27 and 66.60 is: 100.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.83 : 120.27 = 66.60 : x
  2. Step 2: Convert to fraction form
    79.83/120.27 = 66.60/x
  3. Step 3: Cross multiply
    79.83x = 120.27 × 66.60
  4. Step 4: Simplify right side
    79.83x = 8,009.98
  5. Step 5: Solve for x
    x = 8,009.98/79.83
  6. Step 6: Final answer
    x = 100.34

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.