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Finding the Fourth Proportional to 121.41, 182.12 and 78.93

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Solution

The fourth proportional to 121.41, 182.12 and 78.93 is: 118.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.41 : 182.12 = 78.93 : x
  2. Step 2: Convert to fraction form
    121.41/182.12 = 78.93/x
  3. Step 3: Cross multiply
    121.41x = 182.12 × 78.93
  4. Step 4: Simplify right side
    121.41x = 14,374.34
  5. Step 5: Solve for x
    x = 14,374.34/121.41
  6. Step 6: Final answer
    x = 118.40

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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.