Home / 21,279.78-31,905.96-10,186.20

Finding the Fourth Proportional to 21,279.78, 31,905.96 and 10,186.20

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Solution

The fourth proportional to 21,279.78, 31,905.96 and 10,186.20 is: 15,272.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.78 : 31,905.96 = 10,186.20 : x
  2. Step 2: Convert to fraction form
    21,279.78/31,905.96 = 10,186.20/x
  3. Step 3: Cross multiply
    21,279.78x = 31,905.96 × 10,186.20
  4. Step 4: Simplify right side
    21,279.78x = 325,000,489.75
  5. Step 5: Solve for x
    x = 325,000,489.75/21,279.78
  6. Step 6: Final answer
    x = 15,272.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.