Home / 21,115.76-29,140.06-11,684.30

Finding the Fourth Proportional to 21,115.76, 29,140.06 and 11,684.30

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Solution

The fourth proportional to 21,115.76, 29,140.06 and 11,684.30 is: 16,124.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.76 : 29,140.06 = 11,684.30 : x
  2. Step 2: Convert to fraction form
    21,115.76/29,140.06 = 11,684.30/x
  3. Step 3: Cross multiply
    21,115.76x = 29,140.06 × 11,684.30
  4. Step 4: Simplify right side
    21,115.76x = 340,481,203.06
  5. Step 5: Solve for x
    x = 340,481,203.06/21,115.76
  6. Step 6: Final answer
    x = 16,124.51

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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.