Home / 85,842.20-128,763.30-81,003.80

Finding the Fourth Proportional to 85,842.20, 128,763.30 and 81,003.80

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Solution

The fourth proportional to 85,842.20, 128,763.30 and 81,003.80 is: 121,505.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,842.20 : 128,763.30 = 81,003.80 : x
  2. Step 2: Convert to fraction form
    85,842.20/128,763.30 = 81,003.80/x
  3. Step 3: Cross multiply
    85,842.20x = 128,763.30 × 81,003.80
  4. Step 4: Simplify right side
    85,842.20x = 10,430,316,600.54
  5. Step 5: Solve for x
    x = 10,430,316,600.54/85,842.20
  6. Step 6: Final answer
    x = 121,505.70

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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.