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Finding the Fourth Proportional to 15,886.88, 21,926.04 and 9,172.79

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Solution

The fourth proportional to 15,886.88, 21,926.04 and 9,172.79 is: 12,659.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886.88 : 21,926.04 = 9,172.79 : x
  2. Step 2: Convert to fraction form
    15,886.88/21,926.04 = 9,172.79/x
  3. Step 3: Cross multiply
    15,886.88x = 21,926.04 × 9,172.79
  4. Step 4: Simplify right side
    15,886.88x = 201,123,073.58
  5. Step 5: Solve for x
    x = 201,123,073.58/15,886.88
  6. Step 6: Final answer
    x = 12,659.69

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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.