Home / 15,431.73-21,279.87-13,200.99

Finding the Fourth Proportional to 15,431.73, 21,279.87 and 13,200.99

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Solution

The fourth proportional to 15,431.73, 21,279.87 and 13,200.99 is: 18,203.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,431.73 : 21,279.87 = 13,200.99 : x
  2. Step 2: Convert to fraction form
    15,431.73/21,279.87 = 13,200.99/x
  3. Step 3: Cross multiply
    15,431.73x = 21,279.87 × 13,200.99
  4. Step 4: Simplify right side
    15,431.73x = 280,915,351.07
  5. Step 5: Solve for x
    x = 280,915,351.07/15,431.73
  6. Step 6: Final answer
    x = 18,203.75

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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.