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Finding the Fourth Proportional to 205,761.60, 308,509.20 and 87,400.80

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Solution

The fourth proportional to 205,761.60, 308,509.20 and 87,400.80 is: 131,044.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,761.60 : 308,509.20 = 87,400.80 : x
  2. Step 2: Convert to fraction form
    205,761.60/308,509.20 = 87,400.80/x
  3. Step 3: Cross multiply
    205,761.60x = 308,509.20 × 87,400.80
  4. Step 4: Simplify right side
    205,761.60x = 26,963,950,887.36
  5. Step 5: Solve for x
    x = 26,963,950,887.36/205,761.60
  6. Step 6: Final answer
    x = 131,044.62

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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.