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Finding the Fourth Proportional to 1,212.78, 1,819.43 and 432.82

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Solution

The fourth proportional to 1,212.78, 1,819.43 and 432.82 is: 649.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.78 : 1,819.43 = 432.82 : x
  2. Step 2: Convert to fraction form
    1,212.78/1,819.43 = 432.82/x
  3. Step 3: Cross multiply
    1,212.78x = 1,819.43 × 432.82
  4. Step 4: Simplify right side
    1,212.78x = 787,485.69
  5. Step 5: Solve for x
    x = 787,485.69/1,212.78
  6. Step 6: Final answer
    x = 649.32

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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.