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Finding the Fourth Proportional to 15,694.12, 21,657.90 and 8,620.90

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Solution

The fourth proportional to 15,694.12, 21,657.90 and 8,620.90 is: 11,896.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,694.12 : 21,657.90 = 8,620.90 : x
  2. Step 2: Convert to fraction form
    15,694.12/21,657.90 = 8,620.90/x
  3. Step 3: Cross multiply
    15,694.12x = 21,657.90 × 8,620.90
  4. Step 4: Simplify right side
    15,694.12x = 186,710,590.11
  5. Step 5: Solve for x
    x = 186,710,590.11/15,694.12
  6. Step 6: Final answer
    x = 11,896.85

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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.