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Finding the Fourth Proportional to 2,774.72, 4,161.60 and 826.40

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Solution

The fourth proportional to 2,774.72, 4,161.60 and 826.40 is: 1,239.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,774.72 : 4,161.60 = 826.40 : x
  2. Step 2: Convert to fraction form
    2,774.72/4,161.60 = 826.40/x
  3. Step 3: Cross multiply
    2,774.72x = 4,161.60 × 826.40
  4. Step 4: Simplify right side
    2,774.72x = 3,439,146.24
  5. Step 5: Solve for x
    x = 3,439,146.24/2,774.72
  6. Step 6: Final answer
    x = 1,239.46

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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.