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Finding the Fourth Proportional to 91,361.71, 126,080.92 and 51,078.39

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Solution

The fourth proportional to 91,361.71, 126,080.92 and 51,078.39 is: 70,489.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,361.71 : 126,080.92 = 51,078.39 : x
  2. Step 2: Convert to fraction form
    91,361.71/126,080.92 = 51,078.39/x
  3. Step 3: Cross multiply
    91,361.71x = 126,080.92 × 51,078.39
  4. Step 4: Simplify right side
    91,361.71x = 6,440,010,403.32
  5. Step 5: Solve for x
    x = 6,440,010,403.32/91,361.71
  6. Step 6: Final answer
    x = 70,489.16

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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.