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Finding the Fourth Proportional to 120.19, 180.08 and 51.56

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Solution

The fourth proportional to 120.19, 180.08 and 51.56 is: 77.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.19 : 180.08 = 51.56 : x
  2. Step 2: Convert to fraction form
    120.19/180.08 = 51.56/x
  3. Step 3: Cross multiply
    120.19x = 180.08 × 51.56
  4. Step 4: Simplify right side
    120.19x = 9,284.92
  5. Step 5: Solve for x
    x = 9,284.92/120.19
  6. Step 6: Final answer
    x = 77.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.