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Finding the Fourth Proportional to 87,805, 121,135.80 and 51,981.94

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Solution

The fourth proportional to 87,805, 121,135.80 and 51,981.94 is: 71,714.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,805 : 121,135.80 = 51,981.94 : x
  2. Step 2: Convert to fraction form
    87,805/121,135.80 = 51,981.94/x
  3. Step 3: Cross multiply
    87,805x = 121,135.80 × 51,981.94
  4. Step 4: Simplify right side
    87,805x = 6,296,873,887.45
  5. Step 5: Solve for x
    x = 6,296,873,887.45/87,805
  6. Step 6: Final answer
    x = 71,714.30

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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.