Home / 21,155.90-29,185.74-13,600.83

Finding the Fourth Proportional to 21,155.90, 29,185.74 and 13,600.83

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Solution

The fourth proportional to 21,155.90, 29,185.74 and 13,600.83 is: 18,763.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,155.90 : 29,185.74 = 13,600.83 : x
  2. Step 2: Convert to fraction form
    21,155.90/29,185.74 = 13,600.83/x
  3. Step 3: Cross multiply
    21,155.90x = 29,185.74 × 13,600.83
  4. Step 4: Simplify right side
    21,155.90x = 396,950,288.16
  5. Step 5: Solve for x
    x = 396,950,288.16/21,155.90
  6. Step 6: Final answer
    x = 18,763.11

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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.