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Finding the Fourth Proportional to 120.17, 180.36 and 98.75

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Solution

The fourth proportional to 120.17, 180.36 and 98.75 is: 148.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.17 : 180.36 = 98.75 : x
  2. Step 2: Convert to fraction form
    120.17/180.36 = 98.75/x
  3. Step 3: Cross multiply
    120.17x = 180.36 × 98.75
  4. Step 4: Simplify right side
    120.17x = 17,809.65
  5. Step 5: Solve for x
    x = 17,809.65/120.17
  6. Step 6: Final answer
    x = 148.21

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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.