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Finding the Fourth Proportional to 15,305.71, 21,122.91 and 8,591.83

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Solution

The fourth proportional to 15,305.71, 21,122.91 and 8,591.83 is: 11,857.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,305.71 : 21,122.91 = 8,591.83 : x
  2. Step 2: Convert to fraction form
    15,305.71/21,122.91 = 8,591.83/x
  3. Step 3: Cross multiply
    15,305.71x = 21,122.91 × 8,591.83
  4. Step 4: Simplify right side
    15,305.71x = 181,484,451.83
  5. Step 5: Solve for x
    x = 181,484,451.83/15,305.71
  6. Step 6: Final answer
    x = 11,857.30

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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.