Home / 85,936.40-128,904.60-81,015.65

Finding the Fourth Proportional to 85,936.40, 128,904.60 and 81,015.65

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Solution

The fourth proportional to 85,936.40, 128,904.60 and 81,015.65 is: 121,523.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,936.40 : 128,904.60 = 81,015.65 : x
  2. Step 2: Convert to fraction form
    85,936.40/128,904.60 = 81,015.65/x
  3. Step 3: Cross multiply
    85,936.40x = 128,904.60 × 81,015.65
  4. Step 4: Simplify right side
    85,936.40x = 10,443,289,956.99
  5. Step 5: Solve for x
    x = 10,443,289,956.99/85,936.40
  6. Step 6: Final answer
    x = 121,523.48

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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.