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Finding the Fourth Proportional to 139,634.56, 209,420.29 and 39,792.61

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Solution

The fourth proportional to 139,634.56, 209,420.29 and 39,792.61 is: 59,679.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,634.56 : 209,420.29 = 39,792.61 : x
  2. Step 2: Convert to fraction form
    139,634.56/209,420.29 = 39,792.61/x
  3. Step 3: Cross multiply
    139,634.56x = 209,420.29 × 39,792.61
  4. Step 4: Simplify right side
    139,634.56x = 8,333,379,926.06
  5. Step 5: Solve for x
    x = 8,333,379,926.06/139,634.56
  6. Step 6: Final answer
    x = 59,679.92

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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.