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Finding the Fourth Proportional to 28,456.84, 42,692.28 and 11,811.88

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Solution

The fourth proportional to 28,456.84, 42,692.28 and 11,811.88 is: 17,720.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,456.84 : 42,692.28 = 11,811.88 : x
  2. Step 2: Convert to fraction form
    28,456.84/42,692.28 = 11,811.88/x
  3. Step 3: Cross multiply
    28,456.84x = 42,692.28 × 11,811.88
  4. Step 4: Simplify right side
    28,456.84x = 504,276,088.29
  5. Step 5: Solve for x
    x = 504,276,088.29/28,456.84
  6. Step 6: Final answer
    x = 17,720.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.