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Finding the Fourth Proportional to 139,382.40, 192,349.80 and 75,721.44

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Solution

The fourth proportional to 139,382.40, 192,349.80 and 75,721.44 is: 104,496.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,382.40 : 192,349.80 = 75,721.44 : x
  2. Step 2: Convert to fraction form
    139,382.40/192,349.80 = 75,721.44/x
  3. Step 3: Cross multiply
    139,382.40x = 192,349.80 × 75,721.44
  4. Step 4: Simplify right side
    139,382.40x = 14,565,003,839.71
  5. Step 5: Solve for x
    x = 14,565,003,839.71/139,382.40
  6. Step 6: Final answer
    x = 104,496.72

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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.