Home / 3,911.65-5,398.20-2,143.36

Finding the Fourth Proportional to 3,911.65, 5,398.20 and 2,143.36

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Solution

The fourth proportional to 3,911.65, 5,398.20 and 2,143.36 is: 2,957.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.65 : 5,398.20 = 2,143.36 : x
  2. Step 2: Convert to fraction form
    3,911.65/5,398.20 = 2,143.36/x
  3. Step 3: Cross multiply
    3,911.65x = 5,398.20 × 2,143.36
  4. Step 4: Simplify right side
    3,911.65x = 11,570,285.95
  5. Step 5: Solve for x
    x = 11,570,285.95/3,911.65
  6. Step 6: Final answer
    x = 2,957.90

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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.