Home / 1,212.31-1,818.39-432.28

Finding the Fourth Proportional to 1,212.31, 1,818.39 and 432.28

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Solution

The fourth proportional to 1,212.31, 1,818.39 and 432.28 is: 648.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.31 : 1,818.39 = 432.28 : x
  2. Step 2: Convert to fraction form
    1,212.31/1,818.39 = 432.28/x
  3. Step 3: Cross multiply
    1,212.31x = 1,818.39 × 432.28
  4. Step 4: Simplify right side
    1,212.31x = 786,044.54
  5. Step 5: Solve for x
    x = 786,044.54/1,212.31
  6. Step 6: Final answer
    x = 648.39

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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.