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Finding the Fourth Proportional to 100,857.70, 151,270.35 and 30,720.70

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Solution

The fourth proportional to 100,857.70, 151,270.35 and 30,720.70 is: 46,076.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,857.70 : 151,270.35 = 30,720.70 : x
  2. Step 2: Convert to fraction form
    100,857.70/151,270.35 = 30,720.70/x
  3. Step 3: Cross multiply
    100,857.70x = 151,270.35 × 30,720.70
  4. Step 4: Simplify right side
    100,857.70x = 4,647,131,041.25
  5. Step 5: Solve for x
    x = 4,647,131,041.25/100,857.70
  6. Step 6: Final answer
    x = 46,076.12

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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.