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Finding the Fourth Proportional to 20,764.88, 28,655.88 and 11,333.84

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Solution

The fourth proportional to 20,764.88, 28,655.88 and 11,333.84 is: 15,640.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,764.88 : 28,655.88 = 11,333.84 : x
  2. Step 2: Convert to fraction form
    20,764.88/28,655.88 = 11,333.84/x
  3. Step 3: Cross multiply
    20,764.88x = 28,655.88 × 11,333.84
  4. Step 4: Simplify right side
    20,764.88x = 324,781,158.98
  5. Step 5: Solve for x
    x = 324,781,158.98/20,764.88
  6. Step 6: Final answer
    x = 15,640.89

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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.