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Finding the Fourth Proportional to 15,649.56, 21,591 and 8,930.34

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Solution

The fourth proportional to 15,649.56, 21,591 and 8,930.34 is: 12,320.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,649.56 : 21,591 = 8,930.34 : x
  2. Step 2: Convert to fraction form
    15,649.56/21,591 = 8,930.34/x
  3. Step 3: Cross multiply
    15,649.56x = 21,591 × 8,930.34
  4. Step 4: Simplify right side
    15,649.56x = 192,814,970.94
  5. Step 5: Solve for x
    x = 192,814,970.94/15,649.56
  6. Step 6: Final answer
    x = 12,320.79

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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.