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Finding the Fourth Proportional to 103,935.80, 155,673.30 and 80,486.20

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Solution

The fourth proportional to 103,935.80, 155,673.30 and 80,486.20 is: 120,550.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,935.80 : 155,673.30 = 80,486.20 : x
  2. Step 2: Convert to fraction form
    103,935.80/155,673.30 = 80,486.20/x
  3. Step 3: Cross multiply
    103,935.80x = 155,673.30 × 80,486.20
  4. Step 4: Simplify right side
    103,935.80x = 12,529,552,358.46
  5. Step 5: Solve for x
    x = 12,529,552,358.46/103,935.80
  6. Step 6: Final answer
    x = 120,550.88

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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.