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Finding the Fourth Proportional to 15,891.30, 21,929.93 and 8,721.34

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Solution

The fourth proportional to 15,891.30, 21,929.93 and 8,721.34 is: 12,035.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.30 : 21,929.93 = 8,721.34 : x
  2. Step 2: Convert to fraction form
    15,891.30/21,929.93 = 8,721.34/x
  3. Step 3: Cross multiply
    15,891.30x = 21,929.93 × 8,721.34
  4. Step 4: Simplify right side
    15,891.30x = 191,258,375.71
  5. Step 5: Solve for x
    x = 191,258,375.71/15,891.30
  6. Step 6: Final answer
    x = 12,035.41

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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.