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Finding the Fourth Proportional to 205,348.60, 307,889.70 and 86,987.80

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Solution

The fourth proportional to 205,348.60, 307,889.70 and 86,987.80 is: 130,425.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,348.60 : 307,889.70 = 86,987.80 : x
  2. Step 2: Convert to fraction form
    205,348.60/307,889.70 = 86,987.80/x
  3. Step 3: Cross multiply
    205,348.60x = 307,889.70 × 86,987.80
  4. Step 4: Simplify right side
    205,348.60x = 26,782,647,645.66
  5. Step 5: Solve for x
    x = 26,782,647,645.66/205,348.60
  6. Step 6: Final answer
    x = 130,425.28

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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.