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Finding the Fourth Proportional to 15,885.92, 21,923.61 and 9,171.83

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Solution

The fourth proportional to 15,885.92, 21,923.61 and 9,171.83 is: 12,657.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.92 : 21,923.61 = 9,171.83 : x
  2. Step 2: Convert to fraction form
    15,885.92/21,923.61 = 9,171.83/x
  3. Step 3: Cross multiply
    15,885.92x = 21,923.61 × 9,171.83
  4. Step 4: Simplify right side
    15,885.92x = 201,079,695.91
  5. Step 5: Solve for x
    x = 201,079,695.91/15,885.92
  6. Step 6: Final answer
    x = 12,657.73

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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.