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Finding the Fourth Proportional to 120.83, 180.10 and 113.08

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Solution

The fourth proportional to 120.83, 180.10 and 113.08 is: 168.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.83 : 180.10 = 113.08 : x
  2. Step 2: Convert to fraction form
    120.83/180.10 = 113.08/x
  3. Step 3: Cross multiply
    120.83x = 180.10 × 113.08
  4. Step 4: Simplify right side
    120.83x = 20,365.71
  5. Step 5: Solve for x
    x = 20,365.71/120.83
  6. Step 6: Final answer
    x = 168.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.