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Finding the Fourth Proportional to 122.40, 183.75 and 99.75

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Solution

The fourth proportional to 122.40, 183.75 and 99.75 is: 149.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.40 : 183.75 = 99.75 : x
  2. Step 2: Convert to fraction form
    122.40/183.75 = 99.75/x
  3. Step 3: Cross multiply
    122.40x = 183.75 × 99.75
  4. Step 4: Simplify right side
    122.40x = 18,329.06
  5. Step 5: Solve for x
    x = 18,329.06/122.40
  6. Step 6: Final answer
    x = 149.75

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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.