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Finding the Fourth Proportional to 25,879.20, 38,731.32 and 21,505.20

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Solution

The fourth proportional to 25,879.20, 38,731.32 and 21,505.20 is: 32,185.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,879.20 : 38,731.32 = 21,505.20 : x
  2. Step 2: Convert to fraction form
    25,879.20/38,731.32 = 21,505.20/x
  3. Step 3: Cross multiply
    25,879.20x = 38,731.32 × 21,505.20
  4. Step 4: Simplify right side
    25,879.20x = 832,924,782.86
  5. Step 5: Solve for x
    x = 832,924,782.86/25,879.20
  6. Step 6: Final answer
    x = 32,185.11

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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.