Home / 85,540.20-128,338.78-53,913.76

Finding the Fourth Proportional to 85,540.20, 128,338.78 and 53,913.76

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Solution

The fourth proportional to 85,540.20, 128,338.78 and 53,913.76 is: 80,888.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,540.20 : 128,338.78 = 53,913.76 : x
  2. Step 2: Convert to fraction form
    85,540.20/128,338.78 = 53,913.76/x
  3. Step 3: Cross multiply
    85,540.20x = 128,338.78 × 53,913.76
  4. Step 4: Simplify right side
    85,540.20x = 6,919,226,183.61
  5. Step 5: Solve for x
    x = 6,919,226,183.61/85,540.20
  6. Step 6: Final answer
    x = 80,888.59

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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.