Home / 21,118.22-29,144.51-11,686.78

Finding the Fourth Proportional to 21,118.22, 29,144.51 and 11,686.78

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Solution

The fourth proportional to 21,118.22, 29,144.51 and 11,686.78 is: 16,128.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.22 : 29,144.51 = 11,686.78 : x
  2. Step 2: Convert to fraction form
    21,118.22/29,144.51 = 11,686.78/x
  3. Step 3: Cross multiply
    21,118.22x = 29,144.51 × 11,686.78
  4. Step 4: Simplify right side
    21,118.22x = 340,605,498.40
  5. Step 5: Solve for x
    x = 340,605,498.40/21,118.22
  6. Step 6: Final answer
    x = 16,128.51

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1.5x scale

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.