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Finding the Fourth Proportional to 139,120.92, 191,987.15 and 75,458.97

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Solution

The fourth proportional to 139,120.92, 191,987.15 and 75,458.97 is: 104,133.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,120.92 : 191,987.15 = 75,458.97 : x
  2. Step 2: Convert to fraction form
    139,120.92/191,987.15 = 75,458.97/x
  3. Step 3: Cross multiply
    139,120.92x = 191,987.15 × 75,458.97
  4. Step 4: Simplify right side
    139,120.92x = 14,487,152,214.94
  5. Step 5: Solve for x
    x = 14,487,152,214.94/139,120.92
  6. Step 6: Final answer
    x = 104,133.53

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1.5x scale

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.