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Finding the Fourth Proportional to 90,620.84, 135,807.06 and 68,416.04

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Solution

The fourth proportional to 90,620.84, 135,807.06 and 68,416.04 is: 102,530.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,620.84 : 135,807.06 = 68,416.04 : x
  2. Step 2: Convert to fraction form
    90,620.84/135,807.06 = 68,416.04/x
  3. Step 3: Cross multiply
    90,620.84x = 135,807.06 × 68,416.04
  4. Step 4: Simplify right side
    90,620.84x = 9,291,381,249.24
  5. Step 5: Solve for x
    x = 9,291,381,249.24/90,620.84
  6. Step 6: Final answer
    x = 102,530.29

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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.