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Finding the Fourth Proportional to 85,843.20, 128,764.80 and 81,004.80

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Solution

The fourth proportional to 85,843.20, 128,764.80 and 81,004.80 is: 121,507.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,843.20 : 128,764.80 = 81,004.80 : x
  2. Step 2: Convert to fraction form
    85,843.20/128,764.80 = 81,004.80/x
  3. Step 3: Cross multiply
    85,843.20x = 128,764.80 × 81,004.80
  4. Step 4: Simplify right side
    85,843.20x = 10,430,566,871.04
  5. Step 5: Solve for x
    x = 10,430,566,871.04/85,843.20
  6. Step 6: Final answer
    x = 121,507.20

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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.