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Finding the Fourth Proportional to 121,361.90, 181,978.05 and 51,161.90

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Solution

The fourth proportional to 121,361.90, 181,978.05 and 51,161.90 is: 76,715.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,361.90 : 181,978.05 = 51,161.90 : x
  2. Step 2: Convert to fraction form
    121,361.90/181,978.05 = 51,161.90/x
  3. Step 3: Cross multiply
    121,361.90x = 181,978.05 × 51,161.90
  4. Step 4: Simplify right side
    121,361.90x = 9,310,342,796.30
  5. Step 5: Solve for x
    x = 9,310,342,796.30/121,361.90
  6. Step 6: Final answer
    x = 76,715.53

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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.