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Finding the Fourth Proportional to 7,186.78, 10,780.20 and 1,992.28

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Solution

The fourth proportional to 7,186.78, 10,780.20 and 1,992.28 is: 2,988.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,186.78 : 10,780.20 = 1,992.28 : x
  2. Step 2: Convert to fraction form
    7,186.78/10,780.20 = 1,992.28/x
  3. Step 3: Cross multiply
    7,186.78x = 10,780.20 × 1,992.28
  4. Step 4: Simplify right side
    7,186.78x = 21,477,176.86
  5. Step 5: Solve for x
    x = 21,477,176.86/7,186.78
  6. Step 6: Final answer
    x = 2,988.43

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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.