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Finding the Fourth Proportional to 121.01, 181.18 and 100.65

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Solution

The fourth proportional to 121.01, 181.18 and 100.65 is: 150.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.01 : 181.18 = 100.65 : x
  2. Step 2: Convert to fraction form
    121.01/181.18 = 100.65/x
  3. Step 3: Cross multiply
    121.01x = 181.18 × 100.65
  4. Step 4: Simplify right side
    121.01x = 18,235.52
  5. Step 5: Solve for x
    x = 18,235.52/121.01
  6. Step 6: Final answer
    x = 150.70

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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.