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Finding the Fourth Proportional to 139,159.30, 192,057.92 and 77,928.80

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Solution

The fourth proportional to 139,159.30, 192,057.92 and 77,928.80 is: 107,551.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,159.30 : 192,057.92 = 77,928.80 : x
  2. Step 2: Convert to fraction form
    139,159.30/192,057.92 = 77,928.80/x
  3. Step 3: Cross multiply
    139,159.30x = 192,057.92 × 77,928.80
  4. Step 4: Simplify right side
    139,159.30x = 14,966,843,236.10
  5. Step 5: Solve for x
    x = 14,966,843,236.10/139,159.30
  6. Step 6: Final answer
    x = 107,551.87

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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.