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Finding the Fourth Proportional to 121,898.20, 182,490.90 and 86,906.20

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Solution

The fourth proportional to 121,898.20, 182,490.90 and 86,906.20 is: 130,105.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,898.20 : 182,490.90 = 86,906.20 : x
  2. Step 2: Convert to fraction form
    121,898.20/182,490.90 = 86,906.20/x
  3. Step 3: Cross multiply
    121,898.20x = 182,490.90 × 86,906.20
  4. Step 4: Simplify right side
    121,898.20x = 15,859,590,653.58
  5. Step 5: Solve for x
    x = 15,859,590,653.58/121,898.20
  6. Step 6: Final answer
    x = 130,105.21

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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.