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Finding the Fourth Proportional to 103,990.80, 143,468.82 and 68,200.68

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Solution

The fourth proportional to 103,990.80, 143,468.82 and 68,200.68 is: 94,091.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,990.80 : 143,468.82 = 68,200.68 : x
  2. Step 2: Convert to fraction form
    103,990.80/143,468.82 = 68,200.68/x
  3. Step 3: Cross multiply
    103,990.80x = 143,468.82 × 68,200.68
  4. Step 4: Simplify right side
    103,990.80x = 9,784,671,082.80
  5. Step 5: Solve for x
    x = 9,784,671,082.80/103,990.80
  6. Step 6: Final answer
    x = 94,091.70

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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.