Home / 3,881.90-5,356.86-2,113.40

Finding the Fourth Proportional to 3,881.90, 5,356.86 and 2,113.40

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Solution

The fourth proportional to 3,881.90, 5,356.86 and 2,113.40 is: 2,916.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,881.90 : 5,356.86 = 2,113.40 : x
  2. Step 2: Convert to fraction form
    3,881.90/5,356.86 = 2,113.40/x
  3. Step 3: Cross multiply
    3,881.90x = 5,356.86 × 2,113.40
  4. Step 4: Simplify right side
    3,881.90x = 11,321,187.92
  5. Step 5: Solve for x
    x = 11,321,187.92/3,881.90
  6. Step 6: Final answer
    x = 2,916.40

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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.