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Finding the Fourth Proportional to 120.83, 166.79 and 71.72

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Solution

The fourth proportional to 120.83, 166.79 and 71.72 is: 99.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.83 : 166.79 = 71.72 : x
  2. Step 2: Convert to fraction form
    120.83/166.79 = 71.72/x
  3. Step 3: Cross multiply
    120.83x = 166.79 × 71.72
  4. Step 4: Simplify right side
    120.83x = 11,962.15
  5. Step 5: Solve for x
    x = 11,962.15/120.83
  6. Step 6: Final answer
    x = 99.00

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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.