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Finding the Fourth Proportional to 15,689.91, 21,652.22 and 8,616.48

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Solution

The fourth proportional to 15,689.91, 21,652.22 and 8,616.48 is: 11,890.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.91 : 21,652.22 = 8,616.48 : x
  2. Step 2: Convert to fraction form
    15,689.91/21,652.22 = 8,616.48/x
  3. Step 3: Cross multiply
    15,689.91x = 21,652.22 × 8,616.48
  4. Step 4: Simplify right side
    15,689.91x = 186,565,942.13
  5. Step 5: Solve for x
    x = 186,565,942.13/15,689.91
  6. Step 6: Final answer
    x = 11,890.82

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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.