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Finding the Fourth Proportional to 100,085.35, 150,128.12 and 40,921.02

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Solution

The fourth proportional to 100,085.35, 150,128.12 and 40,921.02 is: 61,381.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,085.35 : 150,128.12 = 40,921.02 : x
  2. Step 2: Convert to fraction form
    100,085.35/150,128.12 = 40,921.02/x
  3. Step 3: Cross multiply
    100,085.35x = 150,128.12 × 40,921.02
  4. Step 4: Simplify right side
    100,085.35x = 6,143,395,801.08
  5. Step 5: Solve for x
    x = 6,143,395,801.08/100,085.35
  6. Step 6: Final answer
    x = 61,381.57

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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.