Home / 85,844.20-128,766.30-81,005.80

Finding the Fourth Proportional to 85,844.20, 128,766.30 and 81,005.80

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Solution

The fourth proportional to 85,844.20, 128,766.30 and 81,005.80 is: 121,508.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,844.20 : 128,766.30 = 81,005.80 : x
  2. Step 2: Convert to fraction form
    85,844.20/128,766.30 = 81,005.80/x
  3. Step 3: Cross multiply
    85,844.20x = 128,766.30 × 81,005.80
  4. Step 4: Simplify right side
    85,844.20x = 10,430,817,144.54
  5. Step 5: Solve for x
    x = 10,430,817,144.54/85,844.20
  6. Step 6: Final answer
    x = 121,508.70

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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.