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Finding the Fourth Proportional to 122.31, 183.60 and 78.84

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Solution

The fourth proportional to 122.31, 183.60 and 78.84 is: 118.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.31 : 183.60 = 78.84 : x
  2. Step 2: Convert to fraction form
    122.31/183.60 = 78.84/x
  3. Step 3: Cross multiply
    122.31x = 183.60 × 78.84
  4. Step 4: Simplify right side
    122.31x = 14,475.02
  5. Step 5: Solve for x
    x = 14,475.02/122.31
  6. Step 6: Final answer
    x = 118.35

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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.