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Finding the Fourth Proportional to 15,882.50, 21,917.88 and 8,712.47

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Solution

The fourth proportional to 15,882.50, 21,917.88 and 8,712.47 is: 12,023.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,882.50 : 21,917.88 = 8,712.47 : x
  2. Step 2: Convert to fraction form
    15,882.50/21,917.88 = 8,712.47/x
  3. Step 3: Cross multiply
    15,882.50x = 21,917.88 × 8,712.47
  4. Step 4: Simplify right side
    15,882.50x = 190,958,842.71
  5. Step 5: Solve for x
    x = 190,958,842.71/15,882.50
  6. Step 6: Final answer
    x = 12,023.23

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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.