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Finding the Fourth Proportional to 139,109.70, 191,971.61 and 75,447.55

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Solution

The fourth proportional to 139,109.70, 191,971.61 and 75,447.55 is: 104,117.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,109.70 : 191,971.61 = 75,447.55 : x
  2. Step 2: Convert to fraction form
    139,109.70/191,971.61 = 75,447.55/x
  3. Step 3: Cross multiply
    139,109.70x = 191,971.61 × 75,447.55
  4. Step 4: Simplify right side
    139,109.70x = 14,483,787,644.06
  5. Step 5: Solve for x
    x = 14,483,787,644.06/139,109.70
  6. Step 6: Final answer
    x = 104,117.74

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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.