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Finding the Fourth Proportional to 81,252.51, 121,879.14 and 21,280.86

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Solution

The fourth proportional to 81,252.51, 121,879.14 and 21,280.86 is: 31,921.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,252.51 : 121,879.14 = 21,280.86 : x
  2. Step 2: Convert to fraction form
    81,252.51/121,879.14 = 21,280.86/x
  3. Step 3: Cross multiply
    81,252.51x = 121,879.14 × 21,280.86
  4. Step 4: Simplify right side
    81,252.51x = 2,593,692,915.26
  5. Step 5: Solve for x
    x = 2,593,692,915.26/81,252.51
  6. Step 6: Final answer
    x = 31,921.39

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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.