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Finding the Fourth Proportional to 91,571.68, 126,361.92 and 51,280

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Solution

The fourth proportional to 91,571.68, 126,361.92 and 51,280 is: 70,762.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,571.68 : 126,361.92 = 51,280 : x
  2. Step 2: Convert to fraction form
    91,571.68/126,361.92 = 51,280/x
  3. Step 3: Cross multiply
    91,571.68x = 126,361.92 × 51,280
  4. Step 4: Simplify right side
    91,571.68x = 6,479,839,257.60
  5. Step 5: Solve for x
    x = 6,479,839,257.60/91,571.68
  6. Step 6: Final answer
    x = 70,762.48

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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.