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Finding the Fourth Proportional to 139,033.36, 191,869.02 and 78,600.40

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Solution

The fourth proportional to 139,033.36, 191,869.02 and 78,600.40 is: 108,470.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,033.36 : 191,869.02 = 78,600.40 : x
  2. Step 2: Convert to fraction form
    139,033.36/191,869.02 = 78,600.40/x
  3. Step 3: Cross multiply
    139,033.36x = 191,869.02 × 78,600.40
  4. Step 4: Simplify right side
    139,033.36x = 15,080,981,719.61
  5. Step 5: Solve for x
    x = 15,080,981,719.61/139,033.36
  6. Step 6: Final answer
    x = 108,470.24

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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.