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Finding the Fourth Proportional to 85,422.57, 128,410.44 and 79,259.32

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Solution

The fourth proportional to 85,422.57, 128,410.44 and 79,259.32 is: 119,145.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,422.57 : 128,410.44 = 79,259.32 : x
  2. Step 2: Convert to fraction form
    85,422.57/128,410.44 = 79,259.32/x
  3. Step 3: Cross multiply
    85,422.57x = 128,410.44 × 79,259.32
  4. Step 4: Simplify right side
    85,422.57x = 10,177,724,155.30
  5. Step 5: Solve for x
    x = 10,177,724,155.30/85,422.57
  6. Step 6: Final answer
    x = 119,145.61

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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.