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Finding the Fourth Proportional to 85,310.20, 128,003.70 and 40,919.80

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Solution

The fourth proportional to 85,310.20, 128,003.70 and 40,919.80 is: 61,398.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,310.20 : 128,003.70 = 40,919.80 : x
  2. Step 2: Convert to fraction form
    85,310.20/128,003.70 = 40,919.80/x
  3. Step 3: Cross multiply
    85,310.20x = 128,003.70 × 40,919.80
  4. Step 4: Simplify right side
    85,310.20x = 5,237,885,803.26
  5. Step 5: Solve for x
    x = 5,237,885,803.26/85,310.20
  6. Step 6: Final answer
    x = 61,398.12

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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.