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Finding the Fourth Proportional to 445.64, 668.45 and 121.01

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Solution

The fourth proportional to 445.64, 668.45 and 121.01 is: 181.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.64 : 668.45 = 121.01 : x
  2. Step 2: Convert to fraction form
    445.64/668.45 = 121.01/x
  3. Step 3: Cross multiply
    445.64x = 668.45 × 121.01
  4. Step 4: Simplify right side
    445.64x = 80,885.19
  5. Step 5: Solve for x
    x = 80,885.19/445.64
  6. Step 6: Final answer
    x = 181.51

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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.