Home / 21,090.24-31,638.48-12,776.64

Finding the Fourth Proportional to 21,090.24, 31,638.48 and 12,776.64

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Solution

The fourth proportional to 21,090.24, 31,638.48 and 12,776.64 is: 19,166.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.24 : 31,638.48 = 12,776.64 : x
  2. Step 2: Convert to fraction form
    21,090.24/31,638.48 = 12,776.64/x
  3. Step 3: Cross multiply
    21,090.24x = 31,638.48 × 12,776.64
  4. Step 4: Simplify right side
    21,090.24x = 404,233,469.11
  5. Step 5: Solve for x
    x = 404,233,469.11/21,090.24
  6. Step 6: Final answer
    x = 19,166.85

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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.