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Finding the Fourth Proportional to 512.51, 768.69 and 147.22

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Solution

The fourth proportional to 512.51, 768.69 and 147.22 is: 220.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.51 : 768.69 = 147.22 : x
  2. Step 2: Convert to fraction form
    512.51/768.69 = 147.22/x
  3. Step 3: Cross multiply
    512.51x = 768.69 × 147.22
  4. Step 4: Simplify right side
    512.51x = 113,164.07
  5. Step 5: Solve for x
    x = 113,164.07/512.51
  6. Step 6: Final answer
    x = 220.80

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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.