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Finding the Fourth Proportional to 139,006.60, 208,348.61 and 63,969.21

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Solution

The fourth proportional to 139,006.60, 208,348.61 and 63,969.21 is: 95,879.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,006.60 : 208,348.61 = 63,969.21 : x
  2. Step 2: Convert to fraction form
    139,006.60/208,348.61 = 63,969.21/x
  3. Step 3: Cross multiply
    139,006.60x = 208,348.61 × 63,969.21
  4. Step 4: Simplify right side
    139,006.60x = 13,327,895,666.45
  5. Step 5: Solve for x
    x = 13,327,895,666.45/139,006.60
  6. Step 6: Final answer
    x = 95,879.59

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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.