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Finding the Fourth Proportional to 121.45, 181.77 and 101.20

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Solution

The fourth proportional to 121.45, 181.77 and 101.20 is: 151.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.45 : 181.77 = 101.20 : x
  2. Step 2: Convert to fraction form
    121.45/181.77 = 101.20/x
  3. Step 3: Cross multiply
    121.45x = 181.77 × 101.20
  4. Step 4: Simplify right side
    121.45x = 18,395.12
  5. Step 5: Solve for x
    x = 18,395.12/121.45
  6. Step 6: Final answer
    x = 151.46

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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.