Home / 91,084.53-135,721.32-81,147.45

Finding the Fourth Proportional to 91,084.53, 135,721.32 and 81,147.45

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Solution

The fourth proportional to 91,084.53, 135,721.32 and 81,147.45 is: 120,914.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,084.53 : 135,721.32 = 81,147.45 : x
  2. Step 2: Convert to fraction form
    91,084.53/135,721.32 = 81,147.45/x
  3. Step 3: Cross multiply
    91,084.53x = 135,721.32 × 81,147.45
  4. Step 4: Simplify right side
    91,084.53x = 11,013,439,028.63
  5. Step 5: Solve for x
    x = 11,013,439,028.63/91,084.53
  6. Step 6: Final answer
    x = 120,914.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.