Home / 21,126.88-31,721.37-11,785.15

Finding the Fourth Proportional to 21,126.88, 31,721.37 and 11,785.15

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Solution

The fourth proportional to 21,126.88, 31,721.37 and 11,785.15 is: 17,695.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,126.88 : 31,721.37 = 11,785.15 : x
  2. Step 2: Convert to fraction form
    21,126.88/31,721.37 = 11,785.15/x
  3. Step 3: Cross multiply
    21,126.88x = 31,721.37 × 11,785.15
  4. Step 4: Simplify right side
    21,126.88x = 373,841,103.66
  5. Step 5: Solve for x
    x = 373,841,103.66/21,126.88
  6. Step 6: Final answer
    x = 17,695.05

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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.