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Finding the Fourth Proportional to 139,009.80, 208,493.10 and 39,160.20

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Solution

The fourth proportional to 139,009.80, 208,493.10 and 39,160.20 is: 58,734.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,009.80 : 208,493.10 = 39,160.20 : x
  2. Step 2: Convert to fraction form
    139,009.80/208,493.10 = 39,160.20/x
  3. Step 3: Cross multiply
    139,009.80x = 208,493.10 × 39,160.20
  4. Step 4: Simplify right side
    139,009.80x = 8,164,631,494.62
  5. Step 5: Solve for x
    x = 8,164,631,494.62/139,009.80
  6. Step 6: Final answer
    x = 58,734.22

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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.