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Finding the Fourth Proportional to 139,026.70, 208,540.05 and 79,977.70

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Solution

The fourth proportional to 139,026.70, 208,540.05 and 79,977.70 is: 119,966.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,026.70 : 208,540.05 = 79,977.70 : x
  2. Step 2: Convert to fraction form
    139,026.70/208,540.05 = 79,977.70/x
  3. Step 3: Cross multiply
    139,026.70x = 208,540.05 × 79,977.70
  4. Step 4: Simplify right side
    139,026.70x = 16,678,553,556.89
  5. Step 5: Solve for x
    x = 16,678,553,556.89/139,026.70
  6. Step 6: Final answer
    x = 119,966.55

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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.