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Finding the Fourth Proportional to 15,909.57, 21,938.09 and 9,939.06

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Solution

The fourth proportional to 15,909.57, 21,938.09 and 9,939.06 is: 13,705.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,909.57 : 21,938.09 = 9,939.06 : x
  2. Step 2: Convert to fraction form
    15,909.57/21,938.09 = 9,939.06/x
  3. Step 3: Cross multiply
    15,909.57x = 21,938.09 × 9,939.06
  4. Step 4: Simplify right side
    15,909.57x = 218,043,992.80
  5. Step 5: Solve for x
    x = 218,043,992.80/15,909.57
  6. Step 6: Final answer
    x = 13,705.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.