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Finding the Fourth Proportional to 1,212.47, 1,818.71 and 432.26

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Solution

The fourth proportional to 1,212.47, 1,818.71 and 432.26 is: 648.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.47 : 1,818.71 = 432.26 : x
  2. Step 2: Convert to fraction form
    1,212.47/1,818.71 = 432.26/x
  3. Step 3: Cross multiply
    1,212.47x = 1,818.71 × 432.26
  4. Step 4: Simplify right side
    1,212.47x = 786,144.33
  5. Step 5: Solve for x
    x = 786,144.33/1,212.47
  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.