Home / 15,418.56-21,279.84-10,121.28

Finding the Fourth Proportional to 15,418.56, 21,279.84 and 10,121.28

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Solution

The fourth proportional to 15,418.56, 21,279.84 and 10,121.28 is: 13,968.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,418.56 : 21,279.84 = 10,121.28 : x
  2. Step 2: Convert to fraction form
    15,418.56/21,279.84 = 10,121.28/x
  3. Step 3: Cross multiply
    15,418.56x = 21,279.84 × 10,121.28
  4. Step 4: Simplify right side
    15,418.56x = 215,379,219.00
  5. Step 5: Solve for x
    x = 215,379,219.00/15,418.56
  6. Step 6: Final answer
    x = 13,968.83

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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.