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Finding the Fourth Proportional to 91,212.40, 136,745.70 and 38,578.60

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Solution

The fourth proportional to 91,212.40, 136,745.70 and 38,578.60 is: 57,837.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,212.40 : 136,745.70 = 38,578.60 : x
  2. Step 2: Convert to fraction form
    91,212.40/136,745.70 = 38,578.60/x
  3. Step 3: Cross multiply
    91,212.40x = 136,745.70 × 38,578.60
  4. Step 4: Simplify right side
    91,212.40x = 5,275,457,662.02
  5. Step 5: Solve for x
    x = 5,275,457,662.02/91,212.40
  6. Step 6: Final answer
    x = 57,837.07

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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.