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Finding the Fourth Proportional to 139,382.86, 192,348.58 and 75,720.72

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Solution

The fourth proportional to 139,382.86, 192,348.58 and 75,720.72 is: 104,494.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,382.86 : 192,348.58 = 75,720.72 : x
  2. Step 2: Convert to fraction form
    139,382.86/192,348.58 = 75,720.72/x
  3. Step 3: Cross multiply
    139,382.86x = 192,348.58 × 75,720.72
  4. Step 4: Simplify right side
    139,382.86x = 14,564,772,968.58
  5. Step 5: Solve for x
    x = 14,564,772,968.58/139,382.86
  6. Step 6: Final answer
    x = 104,494.72

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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.