Home / 21,144.90-31,705.05-7,998.30

Finding the Fourth Proportional to 21,144.90, 31,705.05 and 7,998.30

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Solution

The fourth proportional to 21,144.90, 31,705.05 and 7,998.30 is: 11,992.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,144.90 : 31,705.05 = 7,998.30 : x
  2. Step 2: Convert to fraction form
    21,144.90/31,705.05 = 7,998.30/x
  3. Step 3: Cross multiply
    21,144.90x = 31,705.05 × 7,998.30
  4. Step 4: Simplify right side
    21,144.90x = 253,586,501.42
  5. Step 5: Solve for x
    x = 253,586,501.42/21,144.90
  6. Step 6: Final answer
    x = 11,992.80

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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.