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Finding the Fourth Proportional to 85,486.20, 128,229.30 and 81,403.80

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Solution

The fourth proportional to 85,486.20, 128,229.30 and 81,403.80 is: 122,105.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,486.20 : 128,229.30 = 81,403.80 : x
  2. Step 2: Convert to fraction form
    85,486.20/128,229.30 = 81,403.80/x
  3. Step 3: Cross multiply
    85,486.20x = 128,229.30 × 81,403.80
  4. Step 4: Simplify right side
    85,486.20x = 10,438,352,291.34
  5. Step 5: Solve for x
    x = 10,438,352,291.34/85,486.20
  6. Step 6: Final answer
    x = 122,105.70

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1.5x scale

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.