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Finding the Fourth Proportional to 3,405.78, 4,699.62 and 1,913.76

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Solution

The fourth proportional to 3,405.78, 4,699.62 and 1,913.76 is: 2,640.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,405.78 : 4,699.62 = 1,913.76 : x
  2. Step 2: Convert to fraction form
    3,405.78/4,699.62 = 1,913.76/x
  3. Step 3: Cross multiply
    3,405.78x = 4,699.62 × 1,913.76
  4. Step 4: Simplify right side
    3,405.78x = 8,993,944.77
  5. Step 5: Solve for x
    x = 8,993,944.77/3,405.78
  6. Step 6: Final answer
    x = 2,640.79

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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.