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Finding the Fourth Proportional to 15,891.17, 21,929.74 and 8,817.57

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Solution

The fourth proportional to 15,891.17, 21,929.74 and 8,817.57 is: 12,168.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.17 : 21,929.74 = 8,817.57 : x
  2. Step 2: Convert to fraction form
    15,891.17/21,929.74 = 8,817.57/x
  3. Step 3: Cross multiply
    15,891.17x = 21,929.74 × 8,817.57
  4. Step 4: Simplify right side
    15,891.17x = 193,366,995.49
  5. Step 5: Solve for x
    x = 193,366,995.49/15,891.17
  6. Step 6: Final answer
    x = 12,168.21

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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.