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Finding the Fourth Proportional to 15,691.96, 21,655.26 and 8,618.88

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Solution

The fourth proportional to 15,691.96, 21,655.26 and 8,618.88 is: 11,894.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.96 : 21,655.26 = 8,618.88 : x
  2. Step 2: Convert to fraction form
    15,691.96/21,655.26 = 8,618.88/x
  3. Step 3: Cross multiply
    15,691.96x = 21,655.26 × 8,618.88
  4. Step 4: Simplify right side
    15,691.96x = 186,644,087.31
  5. Step 5: Solve for x
    x = 186,644,087.31/15,691.96
  6. Step 6: Final answer
    x = 11,894.25

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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.