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Finding the Fourth Proportional to 139,382.98, 192,348.74 and 75,720.83

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Solution

The fourth proportional to 139,382.98, 192,348.74 and 75,720.83 is: 104,494.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,382.98 : 192,348.74 = 75,720.83 : x
  2. Step 2: Convert to fraction form
    139,382.98/192,348.74 = 75,720.83/x
  3. Step 3: Cross multiply
    139,382.98x = 192,348.74 × 75,720.83
  4. Step 4: Simplify right side
    139,382.98x = 14,564,806,242.25
  5. Step 5: Solve for x
    x = 14,564,806,242.25/139,382.98
  6. Step 6: Final answer
    x = 104,494.87

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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.