Home / 21,088.73-29,109.77-13,555.73

Finding the Fourth Proportional to 21,088.73, 29,109.77 and 13,555.73

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Solution

The fourth proportional to 21,088.73, 29,109.77 and 13,555.73 is: 18,711.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,088.73 : 29,109.77 = 13,555.73 : x
  2. Step 2: Convert to fraction form
    21,088.73/29,109.77 = 13,555.73/x
  3. Step 3: Cross multiply
    21,088.73x = 29,109.77 × 13,555.73
  4. Step 4: Simplify right side
    21,088.73x = 394,603,969.15
  5. Step 5: Solve for x
    x = 394,603,969.15/21,088.73
  6. Step 6: Final answer
    x = 18,711.61

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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.