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Finding the Fourth Proportional to 139,939.74, 193,122.06 and 79,520.64

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Solution

The fourth proportional to 139,939.74, 193,122.06 and 79,520.64 is: 109,741.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,939.74 : 193,122.06 = 79,520.64 : x
  2. Step 2: Convert to fraction form
    139,939.74/193,122.06 = 79,520.64/x
  3. Step 3: Cross multiply
    139,939.74x = 193,122.06 × 79,520.64
  4. Step 4: Simplify right side
    139,939.74x = 15,357,189,809.32
  5. Step 5: Solve for x
    x = 15,357,189,809.32/139,939.74
  6. Step 6: Final answer
    x = 109,741.45

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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.