Home / 1,212.18-1,818.05-432.15

Finding the Fourth Proportional to 1,212.18, 1,818.05 and 432.15

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Solution

The fourth proportional to 1,212.18, 1,818.05 and 432.15 is: 648.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.18 : 1,818.05 = 432.15 : x
  2. Step 2: Convert to fraction form
    1,212.18/1,818.05 = 432.15/x
  3. Step 3: Cross multiply
    1,212.18x = 1,818.05 × 432.15
  4. Step 4: Simplify right side
    1,212.18x = 785,668.15
  5. Step 5: Solve for x
    x = 785,668.15/1,212.18
  6. Step 6: Final answer
    x = 648.14

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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.