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Finding the Fourth Proportional to 15,720.86, 21,694.89 and 8,647.10

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Solution

The fourth proportional to 15,720.86, 21,694.89 and 8,647.10 is: 11,933.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.86 : 21,694.89 = 8,647.10 : x
  2. Step 2: Convert to fraction form
    15,720.86/21,694.89 = 8,647.10/x
  3. Step 3: Cross multiply
    15,720.86x = 21,694.89 × 8,647.10
  4. Step 4: Simplify right side
    15,720.86x = 187,597,883.32
  5. Step 5: Solve for x
    x = 187,597,883.32/15,720.86
  6. Step 6: Final answer
    x = 11,933.05

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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.