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Finding the Fourth Proportional to 100,629.20, 150,814.20 and 77,139.20

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Solution

The fourth proportional to 100,629.20, 150,814.20 and 77,139.20 is: 115,609.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,629.20 : 150,814.20 = 77,139.20 : x
  2. Step 2: Convert to fraction form
    100,629.20/150,814.20 = 77,139.20/x
  3. Step 3: Cross multiply
    100,629.20x = 150,814.20 × 77,139.20
  4. Step 4: Simplify right side
    100,629.20x = 11,633,686,736.64
  5. Step 5: Solve for x
    x = 11,633,686,736.64/100,629.20
  6. Step 6: Final answer
    x = 115,609.45

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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.