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Finding the Fourth Proportional to 86,143.20, 128,923.20 and 75,645.60

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Solution

The fourth proportional to 86,143.20, 128,923.20 and 75,645.60 is: 113,212.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,143.20 : 128,923.20 = 75,645.60 : x
  2. Step 2: Convert to fraction form
    86,143.20/128,923.20 = 75,645.60/x
  3. Step 3: Cross multiply
    86,143.20x = 128,923.20 × 75,645.60
  4. Step 4: Simplify right side
    86,143.20x = 9,752,472,817.92
  5. Step 5: Solve for x
    x = 9,752,472,817.92/86,143.20
  6. Step 6: Final answer
    x = 113,212.34

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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.