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Finding the Fourth Proportional to 122.18, 183.14 and 78.72

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Solution

The fourth proportional to 122.18, 183.14 and 78.72 is: 118.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.18 : 183.14 = 78.72 : x
  2. Step 2: Convert to fraction form
    122.18/183.14 = 78.72/x
  3. Step 3: Cross multiply
    122.18x = 183.14 × 78.72
  4. Step 4: Simplify right side
    122.18x = 14,416.98
  5. Step 5: Solve for x
    x = 14,416.98/122.18
  6. Step 6: Final answer
    x = 118.00

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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.