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Finding the Fourth Proportional to 15,681.58, 21,639.90 and 8,608.12

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Solution

The fourth proportional to 15,681.58, 21,639.90 and 8,608.12 is: 11,878.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.58 : 21,639.90 = 8,608.12 : x
  2. Step 2: Convert to fraction form
    15,681.58/21,639.90 = 8,608.12/x
  3. Step 3: Cross multiply
    15,681.58x = 21,639.90 × 8,608.12
  4. Step 4: Simplify right side
    15,681.58x = 186,278,855.99
  5. Step 5: Solve for x
    x = 186,278,855.99/15,681.58
  6. Step 6: Final answer
    x = 11,878.83

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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.