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Finding the Fourth Proportional to 139,374.61, 192,349.82 and 78,947.80

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Solution

The fourth proportional to 139,374.61, 192,349.82 and 78,947.80 is: 108,955.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,374.61 : 192,349.82 = 78,947.80 : x
  2. Step 2: Convert to fraction form
    139,374.61/192,349.82 = 78,947.80/x
  3. Step 3: Cross multiply
    139,374.61x = 192,349.82 × 78,947.80
  4. Step 4: Simplify right side
    139,374.61x = 15,185,595,119.40
  5. Step 5: Solve for x
    x = 15,185,595,119.40/139,374.61
  6. Step 6: Final answer
    x = 108,955.25

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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.