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Finding the Fourth Proportional to 122.76, 183.79 and 102.40

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Solution

The fourth proportional to 122.76, 183.79 and 102.40 is: 153.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.76 : 183.79 = 102.40 : x
  2. Step 2: Convert to fraction form
    122.76/183.79 = 102.40/x
  3. Step 3: Cross multiply
    122.76x = 183.79 × 102.40
  4. Step 4: Simplify right side
    122.76x = 18,820.10
  5. Step 5: Solve for x
    x = 18,820.10/122.76
  6. Step 6: Final answer
    x = 153.31

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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.