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Finding the Fourth Proportional to 139,689.90, 192,774.06 and 76,027.68

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Solution

The fourth proportional to 139,689.90, 192,774.06 and 76,027.68 is: 104,919.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,689.90 : 192,774.06 = 76,027.68 : x
  2. Step 2: Convert to fraction form
    139,689.90/192,774.06 = 76,027.68/x
  3. Step 3: Cross multiply
    139,689.90x = 192,774.06 × 76,027.68
  4. Step 4: Simplify right side
    139,689.90x = 14,656,164,545.98
  5. Step 5: Solve for x
    x = 14,656,164,545.98/139,689.90
  6. Step 6: Final answer
    x = 104,919.29

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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.