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Finding the Fourth Proportional to 143,990.63, 198,712.47 and 80,340.69

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Solution

The fourth proportional to 143,990.63, 198,712.47 and 80,340.69 is: 110,873.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,990.63 : 198,712.47 = 80,340.69 : x
  2. Step 2: Convert to fraction form
    143,990.63/198,712.47 = 80,340.69/x
  3. Step 3: Cross multiply
    143,990.63x = 198,712.47 × 80,340.69
  4. Step 4: Simplify right side
    143,990.63x = 15,964,696,951.40
  5. Step 5: Solve for x
    x = 15,964,696,951.40/143,990.63
  6. Step 6: Final answer
    x = 110,873.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.