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Finding the Fourth Proportional to 121.95, 183.08 and 87.63

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Solution

The fourth proportional to 121.95, 183.08 and 87.63 is: 131.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.95 : 183.08 = 87.63 : x
  2. Step 2: Convert to fraction form
    121.95/183.08 = 87.63/x
  3. Step 3: Cross multiply
    121.95x = 183.08 × 87.63
  4. Step 4: Simplify right side
    121.95x = 16,043.30
  5. Step 5: Solve for x
    x = 16,043.30/121.95
  6. Step 6: Final answer
    x = 131.56

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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.