Home / 3,911.40-5,397.75-2,143

Finding the Fourth Proportional to 3,911.40, 5,397.75 and 2,143

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Solution

The fourth proportional to 3,911.40, 5,397.75 and 2,143 is: 2,957.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.40 : 5,397.75 = 2,143 : x
  2. Step 2: Convert to fraction form
    3,911.40/5,397.75 = 2,143/x
  3. Step 3: Cross multiply
    3,911.40x = 5,397.75 × 2,143
  4. Step 4: Simplify right side
    3,911.40x = 11,567,378.25
  5. Step 5: Solve for x
    x = 11,567,378.25/3,911.40
  6. Step 6: Final answer
    x = 2,957.35

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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.