Home / 21,213,619.20-31,820,428.80-12,143,692.80

Finding the Fourth Proportional to 21,213,619.20, 31,820,428.80 and 12,143,692.80

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Solution

The fourth proportional to 21,213,619.20, 31,820,428.80 and 12,143,692.80 is: 18,215,539.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,213,619.20 : 31,820,428.80 = 12,143,692.80 : x
  2. Step 2: Convert to fraction form
    21,213,619.20/31,820,428.80 = 12,143,692.80/x
  3. Step 3: Cross multiply
    21,213,619.20x = 31,820,428.80 × 12,143,692.80
  4. Step 4: Simplify right side
    21,213,619.20x = 386,417,512,111,472.69
  5. Step 5: Solve for x
    x = 386,417,512,111,472.69/21,213,619.20
  6. Step 6: Final answer
    x = 18,215,539.20

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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.