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Finding the Fourth Proportional to 121.63, 182.61 and 87.45

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Solution

The fourth proportional to 121.63, 182.61 and 87.45 is: 131.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.63 : 182.61 = 87.45 : x
  2. Step 2: Convert to fraction form
    121.63/182.61 = 87.45/x
  3. Step 3: Cross multiply
    121.63x = 182.61 × 87.45
  4. Step 4: Simplify right side
    121.63x = 15,969.24
  5. Step 5: Solve for x
    x = 15,969.24/121.63
  6. Step 6: Final answer
    x = 131.29

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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.