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Finding the Fourth Proportional to 100,127.56, 138,028.80 and 76,212.60

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Solution

The fourth proportional to 100,127.56, 138,028.80 and 76,212.60 is: 105,061.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,127.56 : 138,028.80 = 76,212.60 : x
  2. Step 2: Convert to fraction form
    100,127.56/138,028.80 = 76,212.60/x
  3. Step 3: Cross multiply
    100,127.56x = 138,028.80 × 76,212.60
  4. Step 4: Simplify right side
    100,127.56x = 10,519,533,722.88
  5. Step 5: Solve for x
    x = 10,519,533,722.88/100,127.56
  6. Step 6: Final answer
    x = 105,061.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.