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Finding the Fourth Proportional to 139,504.39, 192,507.45 and 78,247.20

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Solution

The fourth proportional to 139,504.39, 192,507.45 and 78,247.20 is: 107,976.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,504.39 : 192,507.45 = 78,247.20 : x
  2. Step 2: Convert to fraction form
    139,504.39/192,507.45 = 78,247.20/x
  3. Step 3: Cross multiply
    139,504.39x = 192,507.45 × 78,247.20
  4. Step 4: Simplify right side
    139,504.39x = 15,063,169,370.12
  5. Step 5: Solve for x
    x = 15,063,169,370.12/139,504.39
  6. Step 6: Final answer
    x = 107,976.31

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1.5x scale

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.