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Finding the Fourth Proportional to 15,763.59, 21,753.80 and 8,689.86

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Solution

The fourth proportional to 15,763.59, 21,753.80 and 8,689.86 is: 11,992.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,763.59 : 21,753.80 = 8,689.86 : x
  2. Step 2: Convert to fraction form
    15,763.59/21,753.80 = 8,689.86/x
  3. Step 3: Cross multiply
    15,763.59x = 21,753.80 × 8,689.86
  4. Step 4: Simplify right side
    15,763.59x = 189,037,476.47
  5. Step 5: Solve for x
    x = 189,037,476.47/15,763.59
  6. Step 6: Final answer
    x = 11,992.03

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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.