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Finding the Fourth Proportional to 139,938.57, 193,115.57 and 79,529.31

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Solution

The fourth proportional to 139,938.57, 193,115.57 and 79,529.31 is: 109,750.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,938.57 : 193,115.57 = 79,529.31 : x
  2. Step 2: Convert to fraction form
    139,938.57/193,115.57 = 79,529.31/x
  3. Step 3: Cross multiply
    139,938.57x = 193,115.57 × 79,529.31
  4. Step 4: Simplify right side
    139,938.57x = 15,358,347,634.71
  5. Step 5: Solve for x
    x = 15,358,347,634.71/139,938.57
  6. Step 6: Final answer
    x = 109,750.64

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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.