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Finding the Fourth Proportional to 3,953.39, 5,455.71 and 2,185

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Solution

The fourth proportional to 3,953.39, 5,455.71 and 2,185 is: 3,015.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,953.39 : 5,455.71 = 2,185 : x
  2. Step 2: Convert to fraction form
    3,953.39/5,455.71 = 2,185/x
  3. Step 3: Cross multiply
    3,953.39x = 5,455.71 × 2,185
  4. Step 4: Simplify right side
    3,953.39x = 11,920,726.35
  5. Step 5: Solve for x
    x = 11,920,726.35/3,953.39
  6. Step 6: Final answer
    x = 3,015.32

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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.