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Finding the Fourth Proportional to 139,043.85, 208,627.80 and 64,123.78

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Solution

The fourth proportional to 139,043.85, 208,627.80 and 64,123.78 is: 96,214.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,043.85 : 208,627.80 = 64,123.78 : x
  2. Step 2: Convert to fraction form
    139,043.85/208,627.80 = 64,123.78/x
  3. Step 3: Cross multiply
    139,043.85x = 208,627.80 × 64,123.78
  4. Step 4: Simplify right side
    139,043.85x = 13,378,003,149.08
  5. Step 5: Solve for x
    x = 13,378,003,149.08/139,043.85
  6. Step 6: Final answer
    x = 96,214.27

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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.