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Finding the Fourth Proportional to 139,126.55, 208,697.88 and 39,278.37

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Solution

The fourth proportional to 139,126.55, 208,697.88 and 39,278.37 is: 58,919.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,126.55 : 208,697.88 = 39,278.37 : x
  2. Step 2: Convert to fraction form
    139,126.55/208,697.88 = 39,278.37/x
  3. Step 3: Cross multiply
    139,126.55x = 208,697.88 × 39,278.37
  4. Step 4: Simplify right side
    139,126.55x = 8,197,312,548.86
  5. Step 5: Solve for x
    x = 8,197,312,548.86/139,126.55
  6. Step 6: Final answer
    x = 58,919.83

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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.