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Finding the Fourth Proportional to 122.55, 184.15 and 64.81

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Solution

The fourth proportional to 122.55, 184.15 and 64.81 is: 97.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.55 : 184.15 = 64.81 : x
  2. Step 2: Convert to fraction form
    122.55/184.15 = 64.81/x
  3. Step 3: Cross multiply
    122.55x = 184.15 × 64.81
  4. Step 4: Simplify right side
    122.55x = 11,935.07
  5. Step 5: Solve for x
    x = 11,935.07/122.55
  6. Step 6: Final answer
    x = 97.39

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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.