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Finding the Fourth Proportional to 85,860.20, 128,790.30 and 81,021.80

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Solution

The fourth proportional to 85,860.20, 128,790.30 and 81,021.80 is: 121,532.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,860.20 : 128,790.30 = 81,021.80 : x
  2. Step 2: Convert to fraction form
    85,860.20/128,790.30 = 81,021.80/x
  3. Step 3: Cross multiply
    85,860.20x = 128,790.30 × 81,021.80
  4. Step 4: Simplify right side
    85,860.20x = 10,434,821,928.54
  5. Step 5: Solve for x
    x = 10,434,821,928.54/85,860.20
  6. Step 6: Final answer
    x = 121,532.70

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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.