Home / 1,212.06-1,818.38-432.20

Finding the Fourth Proportional to 1,212.06, 1,818.38 and 432.20

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Solution

The fourth proportional to 1,212.06, 1,818.38 and 432.20 is: 648.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.06 : 1,818.38 = 432.20 : x
  2. Step 2: Convert to fraction form
    1,212.06/1,818.38 = 432.20/x
  3. Step 3: Cross multiply
    1,212.06x = 1,818.38 × 432.20
  4. Step 4: Simplify right side
    1,212.06x = 785,909.46
  5. Step 5: Solve for x
    x = 785,909.46/1,212.06
  6. Step 6: Final answer
    x = 648.41

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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.