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Finding the Fourth Proportional to 15,689.43, 21,651.42 and 8,616.30

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Solution

The fourth proportional to 15,689.43, 21,651.42 and 8,616.30 is: 11,890.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.43 : 21,651.42 = 8,616.30 : x
  2. Step 2: Convert to fraction form
    15,689.43/21,651.42 = 8,616.30/x
  3. Step 3: Cross multiply
    15,689.43x = 21,651.42 × 8,616.30
  4. Step 4: Simplify right side
    15,689.43x = 186,555,130.15
  5. Step 5: Solve for x
    x = 186,555,130.15/15,689.43
  6. Step 6: Final answer
    x = 11,890.50

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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.