Home / 91,317.36-136,986.96-38,720

Finding the Fourth Proportional to 91,317.36, 136,986.96 and 38,720

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Solution

The fourth proportional to 91,317.36, 136,986.96 and 38,720 is: 58,084.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,317.36 : 136,986.96 = 38,720 : x
  2. Step 2: Convert to fraction form
    91,317.36/136,986.96 = 38,720/x
  3. Step 3: Cross multiply
    91,317.36x = 136,986.96 × 38,720
  4. Step 4: Simplify right side
    91,317.36x = 5,304,135,091.20
  5. Step 5: Solve for x
    x = 5,304,135,091.20/91,317.36
  6. Step 6: Final answer
    x = 58,084.63

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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.