Home / 21,319.31-29,421.56-11,887.88

Finding the Fourth Proportional to 21,319.31, 29,421.56 and 11,887.88

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Solution

The fourth proportional to 21,319.31, 29,421.56 and 11,887.88 is: 16,405.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,319.31 : 29,421.56 = 11,887.88 : x
  2. Step 2: Convert to fraction form
    21,319.31/29,421.56 = 11,887.88/x
  3. Step 3: Cross multiply
    21,319.31x = 29,421.56 × 11,887.88
  4. Step 4: Simplify right side
    21,319.31x = 349,759,857.30
  5. Step 5: Solve for x
    x = 349,759,857.30/21,319.31
  6. Step 6: Final answer
    x = 16,405.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.