Home / 14,122.20-21,207.60-9,991.20

Finding the Fourth Proportional to 14,122.20, 21,207.60 and 9,991.20

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Solution

The fourth proportional to 14,122.20, 21,207.60 and 9,991.20 is: 15,003.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,122.20 : 21,207.60 = 9,991.20 : x
  2. Step 2: Convert to fraction form
    14,122.20/21,207.60 = 9,991.20/x
  3. Step 3: Cross multiply
    14,122.20x = 21,207.60 × 9,991.20
  4. Step 4: Simplify right side
    14,122.20x = 211,889,373.12
  5. Step 5: Solve for x
    x = 211,889,373.12/14,122.20
  6. Step 6: Final answer
    x = 15,003.99

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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.