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Finding the Fourth Proportional to 122.54, 183.78 and 64.71

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Solution

The fourth proportional to 122.54, 183.78 and 64.71 is: 97.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.54 : 183.78 = 64.71 : x
  2. Step 2: Convert to fraction form
    122.54/183.78 = 64.71/x
  3. Step 3: Cross multiply
    122.54x = 183.78 × 64.71
  4. Step 4: Simplify right side
    122.54x = 11,892.40
  5. Step 5: Solve for x
    x = 11,892.40/122.54
  6. Step 6: Final answer
    x = 97.05

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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.