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Finding the Fourth Proportional to 15,687.88, 21,659.42 and 9,725.88

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Solution

The fourth proportional to 15,687.88, 21,659.42 and 9,725.88 is: 13,428.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.88 : 21,659.42 = 9,725.88 : x
  2. Step 2: Convert to fraction form
    15,687.88/21,659.42 = 9,725.88/x
  3. Step 3: Cross multiply
    15,687.88x = 21,659.42 × 9,725.88
  4. Step 4: Simplify right side
    15,687.88x = 210,656,919.79
  5. Step 5: Solve for x
    x = 210,656,919.79/15,687.88
  6. Step 6: Final answer
    x = 13,428.00

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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.