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Finding the Fourth Proportional to 120.39, 180.56 and 55.35

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Solution

The fourth proportional to 120.39, 180.56 and 55.35 is: 83.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.39 : 180.56 = 55.35 : x
  2. Step 2: Convert to fraction form
    120.39/180.56 = 55.35/x
  3. Step 3: Cross multiply
    120.39x = 180.56 × 55.35
  4. Step 4: Simplify right side
    120.39x = 9,993.72
  5. Step 5: Solve for x
    x = 9,993.72/120.39
  6. Step 6: Final answer
    x = 83.01

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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.