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Finding the Fourth Proportional to 139,120.07, 191,985.71 and 78,689.41

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Solution

The fourth proportional to 139,120.07, 191,985.71 and 78,689.41 is: 108,591.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,120.07 : 191,985.71 = 78,689.41 : x
  2. Step 2: Convert to fraction form
    139,120.07/191,985.71 = 78,689.41/x
  3. Step 3: Cross multiply
    139,120.07x = 191,985.71 × 78,689.41
  4. Step 4: Simplify right side
    139,120.07x = 15,107,240,894.96
  5. Step 5: Solve for x
    x = 15,107,240,894.96/139,120.07
  6. Step 6: Final answer
    x = 108,591.39

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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.