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Finding the Fourth Proportional to 139,791.60, 209,881.80 and 87,303.60

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Solution

The fourth proportional to 139,791.60, 209,881.80 and 87,303.60 is: 131,076.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,791.60 : 209,881.80 = 87,303.60 : x
  2. Step 2: Convert to fraction form
    139,791.60/209,881.80 = 87,303.60/x
  3. Step 3: Cross multiply
    139,791.60x = 209,881.80 × 87,303.60
  4. Step 4: Simplify right side
    139,791.60x = 18,323,436,714.48
  5. Step 5: Solve for x
    x = 18,323,436,714.48/139,791.60
  6. Step 6: Final answer
    x = 131,076.81

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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.