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Finding the Fourth Proportional to 28,540.76, 42,811.20 and 7,764.26

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Solution

The fourth proportional to 28,540.76, 42,811.20 and 7,764.26 is: 11,646.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,540.76 : 42,811.20 = 7,764.26 : x
  2. Step 2: Convert to fraction form
    28,540.76/42,811.20 = 7,764.26/x
  3. Step 3: Cross multiply
    28,540.76x = 42,811.20 × 7,764.26
  4. Step 4: Simplify right side
    28,540.76x = 332,397,073.66
  5. Step 5: Solve for x
    x = 332,397,073.66/28,540.76
  6. Step 6: Final answer
    x = 11,646.40

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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.