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Finding the Fourth Proportional to 15,819.77, 21,830.59 and 9,105.61

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Solution

The fourth proportional to 15,819.77, 21,830.59 and 9,105.61 is: 12,565.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,819.77 : 21,830.59 = 9,105.61 : x
  2. Step 2: Convert to fraction form
    15,819.77/21,830.59 = 9,105.61/x
  3. Step 3: Cross multiply
    15,819.77x = 21,830.59 × 9,105.61
  4. Step 4: Simplify right side
    15,819.77x = 198,780,838.61
  5. Step 5: Solve for x
    x = 198,780,838.61/15,819.77
  6. Step 6: Final answer
    x = 12,565.34

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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.