Home / 10,821.80-16,232.70-7,128.20

Finding the Fourth Proportional to 10,821.80, 16,232.70 and 7,128.20

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Solution

The fourth proportional to 10,821.80, 16,232.70 and 7,128.20 is: 10,692.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,821.80 : 16,232.70 = 7,128.20 : x
  2. Step 2: Convert to fraction form
    10,821.80/16,232.70 = 7,128.20/x
  3. Step 3: Cross multiply
    10,821.80x = 16,232.70 × 7,128.20
  4. Step 4: Simplify right side
    10,821.80x = 115,709,932.14
  5. Step 5: Solve for x
    x = 115,709,932.14/10,821.80
  6. Step 6: Final answer
    x = 10,692.30

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1.5x scale

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.