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Finding the Fourth Proportional to 100,085.85, 150,128.87 and 40,921.52

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Solution

The fourth proportional to 100,085.85, 150,128.87 and 40,921.52 is: 61,382.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,085.85 : 150,128.87 = 40,921.52 : x
  2. Step 2: Convert to fraction form
    100,085.85/150,128.87 = 40,921.52/x
  3. Step 3: Cross multiply
    100,085.85x = 150,128.87 × 40,921.52
  4. Step 4: Simplify right side
    100,085.85x = 6,143,500,601.03
  5. Step 5: Solve for x
    x = 6,143,500,601.03/100,085.85
  6. Step 6: Final answer
    x = 61,382.31

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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.