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Finding the Fourth Proportional to 3,953.63, 5,455.74 and 2,185.22

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Solution

The fourth proportional to 3,953.63, 5,455.74 and 2,185.22 is: 3,015.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,953.63 : 5,455.74 = 2,185.22 : x
  2. Step 2: Convert to fraction form
    3,953.63/5,455.74 = 2,185.22/x
  3. Step 3: Cross multiply
    3,953.63x = 5,455.74 × 2,185.22
  4. Step 4: Simplify right side
    3,953.63x = 11,921,992.16
  5. Step 5: Solve for x
    x = 11,921,992.16/3,953.63
  6. Step 6: Final answer
    x = 3,015.45

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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.