Home / 21,090.04-31,619.30-12,768.05

Finding the Fourth Proportional to 21,090.04, 31,619.30 and 12,768.05

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Solution

The fourth proportional to 21,090.04, 31,619.30 and 12,768.05 is: 19,142.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.04 : 31,619.30 = 12,768.05 : x
  2. Step 2: Convert to fraction form
    21,090.04/31,619.30 = 12,768.05/x
  3. Step 3: Cross multiply
    21,090.04x = 31,619.30 × 12,768.05
  4. Step 4: Simplify right side
    21,090.04x = 403,716,914.33
  5. Step 5: Solve for x
    x = 403,716,914.33/21,090.04
  6. Step 6: Final answer
    x = 19,142.54

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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.