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Finding the Fourth Proportional to 15,939.99, 21,999.09 and 9,570.15

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Solution

The fourth proportional to 15,939.99, 21,999.09 and 9,570.15 is: 13,207.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,939.99 : 21,999.09 = 9,570.15 : x
  2. Step 2: Convert to fraction form
    15,939.99/21,999.09 = 9,570.15/x
  3. Step 3: Cross multiply
    15,939.99x = 21,999.09 × 9,570.15
  4. Step 4: Simplify right side
    15,939.99x = 210,534,627.05
  5. Step 5: Solve for x
    x = 210,534,627.05/15,939.99
  6. Step 6: Final answer
    x = 13,207.95

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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.