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Finding the Fourth Proportional to 100,491.20, 150,909.60 and 71,115.20

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Solution

The fourth proportional to 100,491.20, 150,909.60 and 71,115.20 is: 106,795.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,491.20 : 150,909.60 = 71,115.20 : x
  2. Step 2: Convert to fraction form
    100,491.20/150,909.60 = 71,115.20/x
  3. Step 3: Cross multiply
    100,491.20x = 150,909.60 × 71,115.20
  4. Step 4: Simplify right side
    100,491.20x = 10,731,966,385.92
  5. Step 5: Solve for x
    x = 10,731,966,385.92/100,491.20
  6. Step 6: Final answer
    x = 106,795.09

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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.