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Finding the Fourth Proportional to 139,371.61, 209,128.92 and 68,292.91

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Solution

The fourth proportional to 139,371.61, 209,128.92 and 68,292.91 is: 102,474.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,371.61 : 209,128.92 = 68,292.91 : x
  2. Step 2: Convert to fraction form
    139,371.61/209,128.92 = 68,292.91/x
  3. Step 3: Cross multiply
    139,371.61x = 209,128.92 × 68,292.91
  4. Step 4: Simplify right side
    139,371.61x = 14,282,023,489.59
  5. Step 5: Solve for x
    x = 14,282,023,489.59/139,371.61
  6. Step 6: Final answer
    x = 102,474.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.