Home / 115,391.25-159,003.36-85,128.57

Finding the Fourth Proportional to 115,391.25, 159,003.36 and 85,128.57

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Solution

The fourth proportional to 115,391.25, 159,003.36 and 85,128.57 is: 117,302.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,391.25 : 159,003.36 = 85,128.57 : x
  2. Step 2: Convert to fraction form
    115,391.25/159,003.36 = 85,128.57/x
  3. Step 3: Cross multiply
    115,391.25x = 159,003.36 × 85,128.57
  4. Step 4: Simplify right side
    115,391.25x = 13,535,728,662.00
  5. Step 5: Solve for x
    x = 13,535,728,662.00/115,391.25
  6. Step 6: Final answer
    x = 117,302.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.