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Finding the Fourth Proportional to 2,200.78, 3,301.17 and 661.78

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Solution

The fourth proportional to 2,200.78, 3,301.17 and 661.78 is: 992.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,200.78 : 3,301.17 = 661.78 : x
  2. Step 2: Convert to fraction form
    2,200.78/3,301.17 = 661.78/x
  3. Step 3: Cross multiply
    2,200.78x = 3,301.17 × 661.78
  4. Step 4: Simplify right side
    2,200.78x = 2,184,648.28
  5. Step 5: Solve for x
    x = 2,184,648.28/2,200.78
  6. Step 6: Final answer
    x = 992.67

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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.