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Finding the Fourth Proportional to 139,041.57, 191,887.20 and 78,612.80

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Solution

The fourth proportional to 139,041.57, 191,887.20 and 78,612.80 is: 108,491.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,041.57 : 191,887.20 = 78,612.80 : x
  2. Step 2: Convert to fraction form
    139,041.57/191,887.20 = 78,612.80/x
  3. Step 3: Cross multiply
    139,041.57x = 191,887.20 × 78,612.80
  4. Step 4: Simplify right side
    139,041.57x = 15,084,790,076.16
  5. Step 5: Solve for x
    x = 15,084,790,076.16/139,041.57
  6. Step 6: Final answer
    x = 108,491.22

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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.