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Finding the Fourth Proportional to 3,905.77, 5,390.87 and 2,393.79

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Solution

The fourth proportional to 3,905.77, 5,390.87 and 2,393.79 is: 3,303.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.77 : 5,390.87 = 2,393.79 : x
  2. Step 2: Convert to fraction form
    3,905.77/5,390.87 = 2,393.79/x
  3. Step 3: Cross multiply
    3,905.77x = 5,390.87 × 2,393.79
  4. Step 4: Simplify right side
    3,905.77x = 12,904,610.70
  5. Step 5: Solve for x
    x = 12,904,610.70/3,905.77
  6. Step 6: Final answer
    x = 3,303.99

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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.