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Finding the Fourth Proportional to 15,891.91, 21,930.81 and 8,721.87

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Solution

The fourth proportional to 15,891.91, 21,930.81 and 8,721.87 is: 12,036.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.91 : 21,930.81 = 8,721.87 : x
  2. Step 2: Convert to fraction form
    15,891.91/21,930.81 = 8,721.87/x
  3. Step 3: Cross multiply
    15,891.91x = 21,930.81 × 8,721.87
  4. Step 4: Simplify right side
    15,891.91x = 191,277,673.81
  5. Step 5: Solve for x
    x = 191,277,673.81/15,891.91
  6. Step 6: Final answer
    x = 12,036.17

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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.