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Finding the Fourth Proportional to 139,019.76, 191,723.40 and 108,400.44

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Solution

The fourth proportional to 139,019.76, 191,723.40 and 108,400.44 is: 149,496.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,019.76 : 191,723.40 = 108,400.44 : x
  2. Step 2: Convert to fraction form
    139,019.76/191,723.40 = 108,400.44/x
  3. Step 3: Cross multiply
    139,019.76x = 191,723.40 × 108,400.44
  4. Step 4: Simplify right side
    139,019.76x = 20,782,900,918.30
  5. Step 5: Solve for x
    x = 20,782,900,918.30/139,019.76
  6. Step 6: Final answer
    x = 149,496.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.