Home / 427,112.80-639,794.40-216,869.20

Finding the Fourth Proportional to 427,112.80, 639,794.40 and 216,869.20

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Solution

The fourth proportional to 427,112.80, 639,794.40 and 216,869.20 is: 324,859.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,112.80 : 639,794.40 = 216,869.20 : x
  2. Step 2: Convert to fraction form
    427,112.80/639,794.40 = 216,869.20/x
  3. Step 3: Cross multiply
    427,112.80x = 639,794.40 × 216,869.20
  4. Step 4: Simplify right side
    427,112.80x = 138,751,699,692.48
  5. Step 5: Solve for x
    x = 138,751,699,692.48/427,112.80
  6. Step 6: Final answer
    x = 324,859.61

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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.