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Finding the Fourth Proportional to 3,911.39, 5,397.66 and 2,143

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Solution

The fourth proportional to 3,911.39, 5,397.66 and 2,143 is: 2,957.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.39 : 5,397.66 = 2,143 : x
  2. Step 2: Convert to fraction form
    3,911.39/5,397.66 = 2,143/x
  3. Step 3: Cross multiply
    3,911.39x = 5,397.66 × 2,143
  4. Step 4: Simplify right side
    3,911.39x = 11,567,185.38
  5. Step 5: Solve for x
    x = 11,567,185.38/3,911.39
  6. Step 6: Final answer
    x = 2,957.31

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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.