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Finding the Fourth Proportional to 15,761.75, 21,752.21 and 8,688.83

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Solution

The fourth proportional to 15,761.75, 21,752.21 and 8,688.83 is: 11,991.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.75 : 21,752.21 = 8,688.83 : x
  2. Step 2: Convert to fraction form
    15,761.75/21,752.21 = 8,688.83/x
  3. Step 3: Cross multiply
    15,761.75x = 21,752.21 × 8,688.83
  4. Step 4: Simplify right side
    15,761.75x = 189,001,167.78
  5. Step 5: Solve for x
    x = 189,001,167.78/15,761.75
  6. Step 6: Final answer
    x = 11,991.13

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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.