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Finding the Fourth Proportional to 139,854.78, 209,847.78 and 69,739.56

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Solution

The fourth proportional to 139,854.78, 209,847.78 and 69,739.56 is: 104,642.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,854.78 : 209,847.78 = 69,739.56 : x
  2. Step 2: Convert to fraction form
    139,854.78/209,847.78 = 69,739.56/x
  3. Step 3: Cross multiply
    139,854.78x = 209,847.78 × 69,739.56
  4. Step 4: Simplify right side
    139,854.78x = 14,634,691,844.18
  5. Step 5: Solve for x
    x = 14,634,691,844.18/139,854.78
  6. Step 6: Final answer
    x = 104,642.06

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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.