Home / 139,665.09-209,538.95-80,543.19

Finding the Fourth Proportional to 139,665.09, 209,538.95 and 80,543.19

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Solution

The fourth proportional to 139,665.09, 209,538.95 and 80,543.19 is: 120,838.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,665.09 : 209,538.95 = 80,543.19 : x
  2. Step 2: Convert to fraction form
    139,665.09/209,538.95 = 80,543.19/x
  3. Step 3: Cross multiply
    139,665.09x = 209,538.95 × 80,543.19
  4. Step 4: Simplify right side
    139,665.09x = 16,876,936,298.36
  5. Step 5: Solve for x
    x = 16,876,936,298.36/139,665.09
  6. Step 6: Final answer
    x = 120,838.61

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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.