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Finding the Fourth Proportional to 3,902.78, 5,385.78 and 2,134.36

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Solution

The fourth proportional to 3,902.78, 5,385.78 and 2,134.36 is: 2,945.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,902.78 : 5,385.78 = 2,134.36 : x
  2. Step 2: Convert to fraction form
    3,902.78/5,385.78 = 2,134.36/x
  3. Step 3: Cross multiply
    3,902.78x = 5,385.78 × 2,134.36
  4. Step 4: Simplify right side
    3,902.78x = 11,495,193.40
  5. Step 5: Solve for x
    x = 11,495,193.40/3,902.78
  6. Step 6: Final answer
    x = 2,945.39

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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.