Home / 15,647.85-21,581.47-13,755.41

Finding the Fourth Proportional to 15,647.85, 21,581.47 and 13,755.41

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Solution

The fourth proportional to 15,647.85, 21,581.47 and 13,755.41 is: 18,971.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,647.85 : 21,581.47 = 13,755.41 : x
  2. Step 2: Convert to fraction form
    15,647.85/21,581.47 = 13,755.41/x
  3. Step 3: Cross multiply
    15,647.85x = 21,581.47 × 13,755.41
  4. Step 4: Simplify right side
    15,647.85x = 296,862,039.40
  5. Step 5: Solve for x
    x = 296,862,039.40/15,647.85
  6. Step 6: Final answer
    x = 18,971.42

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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.