Home / 85,579.78-128,400.08-38,190.57

Finding the Fourth Proportional to 85,579.78, 128,400.08 and 38,190.57

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Solution

The fourth proportional to 85,579.78, 128,400.08 and 38,190.57 is: 57,299.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,579.78 : 128,400.08 = 38,190.57 : x
  2. Step 2: Convert to fraction form
    85,579.78/128,400.08 = 38,190.57/x
  3. Step 3: Cross multiply
    85,579.78x = 128,400.08 × 38,190.57
  4. Step 4: Simplify right side
    85,579.78x = 4,903,672,243.25
  5. Step 5: Solve for x
    x = 4,903,672,243.25/85,579.78
  6. Step 6: Final answer
    x = 57,299.43

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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.