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Finding the Fourth Proportional to 15,901.55, 21,939.69 and 9,939.28

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Solution

The fourth proportional to 15,901.55, 21,939.69 and 9,939.28 is: 13,713.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,901.55 : 21,939.69 = 9,939.28 : x
  2. Step 2: Convert to fraction form
    15,901.55/21,939.69 = 9,939.28/x
  3. Step 3: Cross multiply
    15,901.55x = 21,939.69 × 9,939.28
  4. Step 4: Simplify right side
    15,901.55x = 218,064,722.02
  5. Step 5: Solve for x
    x = 218,064,722.02/15,901.55
  6. Step 6: Final answer
    x = 13,713.43

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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.