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Finding the Fourth Proportional to 139,861.77, 209,791.11 and 83,717.55

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Solution

The fourth proportional to 139,861.77, 209,791.11 and 83,717.55 is: 125,575.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,861.77 : 209,791.11 = 83,717.55 : x
  2. Step 2: Convert to fraction form
    139,861.77/209,791.11 = 83,717.55/x
  3. Step 3: Cross multiply
    139,861.77x = 209,791.11 × 83,717.55
  4. Step 4: Simplify right side
    139,861.77x = 17,563,197,740.98
  5. Step 5: Solve for x
    x = 17,563,197,740.98/139,861.77
  6. Step 6: Final answer
    x = 125,575.40

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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.