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Finding the Fourth Proportional to 15,891.10, 21,929.65 and 8,817.51

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Solution

The fourth proportional to 15,891.10, 21,929.65 and 8,817.51 is: 12,168.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.10 : 21,929.65 = 8,817.51 : x
  2. Step 2: Convert to fraction form
    15,891.10/21,929.65 = 8,817.51/x
  3. Step 3: Cross multiply
    15,891.10x = 21,929.65 × 8,817.51
  4. Step 4: Simplify right side
    15,891.10x = 193,364,864.37
  5. Step 5: Solve for x
    x = 193,364,864.37/15,891.10
  6. Step 6: Final answer
    x = 12,168.12

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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.