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Finding the Fourth Proportional to 121.19, 182.48 and 99.72

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Solution

The fourth proportional to 121.19, 182.48 and 99.72 is: 150.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.19 : 182.48 = 99.72 : x
  2. Step 2: Convert to fraction form
    121.19/182.48 = 99.72/x
  3. Step 3: Cross multiply
    121.19x = 182.48 × 99.72
  4. Step 4: Simplify right side
    121.19x = 18,196.41
  5. Step 5: Solve for x
    x = 18,196.41/121.19
  6. Step 6: Final answer
    x = 150.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.