Home / 81,474.13-122,128.16-74,291.43

Finding the Fourth Proportional to 81,474.13, 122,128.16 and 74,291.43

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Solution

The fourth proportional to 81,474.13, 122,128.16 and 74,291.43 is: 111,361.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,474.13 : 122,128.16 = 74,291.43 : x
  2. Step 2: Convert to fraction form
    81,474.13/122,128.16 = 74,291.43/x
  3. Step 3: Cross multiply
    81,474.13x = 122,128.16 × 74,291.43
  4. Step 4: Simplify right side
    81,474.13x = 9,073,075,049.22
  5. Step 5: Solve for x
    x = 9,073,075,049.22/81,474.13
  6. Step 6: Final answer
    x = 111,361.43

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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.