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Finding the Fourth Proportional to 15,891.29, 21,929.91 and 8,817.70

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Solution

The fourth proportional to 15,891.29, 21,929.91 and 8,817.70 is: 12,168.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.29 : 21,929.91 = 8,817.70 : x
  2. Step 2: Convert to fraction form
    15,891.29/21,929.91 = 8,817.70/x
  3. Step 3: Cross multiply
    15,891.29x = 21,929.91 × 8,817.70
  4. Step 4: Simplify right side
    15,891.29x = 193,371,257.76
  5. Step 5: Solve for x
    x = 193,371,257.76/15,891.29
  6. Step 6: Final answer
    x = 12,168.38

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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.