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Finding the Fourth Proportional to 68,781.21, 103,186.67 and 21,395.40

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Solution

The fourth proportional to 68,781.21, 103,186.67 and 21,395.40 is: 32,097.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,781.21 : 103,186.67 = 21,395.40 : x
  2. Step 2: Convert to fraction form
    68,781.21/103,186.67 = 21,395.40/x
  3. Step 3: Cross multiply
    68,781.21x = 103,186.67 × 21,395.40
  4. Step 4: Simplify right side
    68,781.21x = 2,207,720,079.32
  5. Step 5: Solve for x
    x = 2,207,720,079.32/68,781.21
  6. Step 6: Final answer
    x = 32,097.72

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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.