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Finding the Fourth Proportional to 139,008.72, 208,845.44 and 89,186.68

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Solution

The fourth proportional to 139,008.72, 208,845.44 and 89,186.68 is: 133,993.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,008.72 : 208,845.44 = 89,186.68 : x
  2. Step 2: Convert to fraction form
    139,008.72/208,845.44 = 89,186.68/x
  3. Step 3: Cross multiply
    139,008.72x = 208,845.44 × 89,186.68
  4. Step 4: Simplify right side
    139,008.72x = 18,626,231,426.74
  5. Step 5: Solve for x
    x = 18,626,231,426.74/139,008.72
  6. Step 6: Final answer
    x = 133,993.26

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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.