Home / 21,090.38-31,643.80-7,943.81

Finding the Fourth Proportional to 21,090.38, 31,643.80 and 7,943.81

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Solution

The fourth proportional to 21,090.38, 31,643.80 and 7,943.81 is: 11,918.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.38 : 31,643.80 = 7,943.81 : x
  2. Step 2: Convert to fraction form
    21,090.38/31,643.80 = 7,943.81/x
  3. Step 3: Cross multiply
    21,090.38x = 31,643.80 × 7,943.81
  4. Step 4: Simplify right side
    21,090.38x = 251,372,156.80
  5. Step 5: Solve for x
    x = 251,372,156.80/21,090.38
  6. Step 6: Final answer
    x = 11,918.81

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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.