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Finding the Fourth Proportional to 103,995.65, 155,981.43 and 29,121.80

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Solution

The fourth proportional to 103,995.65, 155,981.43 and 29,121.80 is: 43,679.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,995.65 : 155,981.43 = 29,121.80 : x
  2. Step 2: Convert to fraction form
    103,995.65/155,981.43 = 29,121.80/x
  3. Step 3: Cross multiply
    103,995.65x = 155,981.43 × 29,121.80
  4. Step 4: Simplify right side
    103,995.65x = 4,542,459,228.27
  5. Step 5: Solve for x
    x = 4,542,459,228.27/103,995.65
  6. Step 6: Final answer
    x = 43,679.32

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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.