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Finding the Fourth Proportional to 15,689.60, 21,651.80 and 8,616.17

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Solution

The fourth proportional to 15,689.60, 21,651.80 and 8,616.17 is: 11,890.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.60 : 21,651.80 = 8,616.17 : x
  2. Step 2: Convert to fraction form
    15,689.60/21,651.80 = 8,616.17/x
  3. Step 3: Cross multiply
    15,689.60x = 21,651.80 × 8,616.17
  4. Step 4: Simplify right side
    15,689.60x = 186,555,589.61
  5. Step 5: Solve for x
    x = 186,555,589.61/15,689.60
  6. Step 6: Final answer
    x = 11,890.40

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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.