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Finding the Fourth Proportional to 100,680.36, 138,942.47 and 55,361.79

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Solution

The fourth proportional to 100,680.36, 138,942.47 and 55,361.79 is: 76,401.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,680.36 : 138,942.47 = 55,361.79 : x
  2. Step 2: Convert to fraction form
    100,680.36/138,942.47 = 55,361.79/x
  3. Step 3: Cross multiply
    100,680.36x = 138,942.47 × 55,361.79
  4. Step 4: Simplify right side
    100,680.36x = 7,692,103,846.22
  5. Step 5: Solve for x
    x = 7,692,103,846.22/100,680.36
  6. Step 6: Final answer
    x = 76,401.24

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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.