Home / 1,212.23-1,818.18-432.20

Finding the Fourth Proportional to 1,212.23, 1,818.18 and 432.20

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Solution

The fourth proportional to 1,212.23, 1,818.18 and 432.20 is: 648.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.23 : 1,818.18 = 432.20 : x
  2. Step 2: Convert to fraction form
    1,212.23/1,818.18 = 432.20/x
  3. Step 3: Cross multiply
    1,212.23x = 1,818.18 × 432.20
  4. Step 4: Simplify right side
    1,212.23x = 785,817.40
  5. Step 5: Solve for x
    x = 785,817.40/1,212.23
  6. Step 6: Final answer
    x = 648.24

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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.