Home / 20,791.78-31,186.69-7,643.18

Finding the Fourth Proportional to 20,791.78, 31,186.69 and 7,643.18

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Solution

The fourth proportional to 20,791.78, 31,186.69 and 7,643.18 is: 11,464.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.78 : 31,186.69 = 7,643.18 : x
  2. Step 2: Convert to fraction form
    20,791.78/31,186.69 = 7,643.18/x
  3. Step 3: Cross multiply
    20,791.78x = 31,186.69 × 7,643.18
  4. Step 4: Simplify right side
    20,791.78x = 238,365,485.27
  5. Step 5: Solve for x
    x = 238,365,485.27/20,791.78
  6. Step 6: Final answer
    x = 11,464.41

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1.5x scale

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.