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Finding the Fourth Proportional to 85,910.08, 128,817.44 and 29,720

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Solution

The fourth proportional to 85,910.08, 128,817.44 and 29,720 is: 44,563.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,910.08 : 128,817.44 = 29,720 : x
  2. Step 2: Convert to fraction form
    85,910.08/128,817.44 = 29,720/x
  3. Step 3: Cross multiply
    85,910.08x = 128,817.44 × 29,720
  4. Step 4: Simplify right side
    85,910.08x = 3,828,454,316.80
  5. Step 5: Solve for x
    x = 3,828,454,316.80/85,910.08
  6. Step 6: Final answer
    x = 44,563.51

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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.