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Finding the Fourth Proportional to 3,881.84, 5,356.80 and 2,113.42

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Solution

The fourth proportional to 3,881.84, 5,356.80 and 2,113.42 is: 2,916.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,881.84 : 5,356.80 = 2,113.42 : x
  2. Step 2: Convert to fraction form
    3,881.84/5,356.80 = 2,113.42/x
  3. Step 3: Cross multiply
    3,881.84x = 5,356.80 × 2,113.42
  4. Step 4: Simplify right side
    3,881.84x = 11,321,168.26
  5. Step 5: Solve for x
    x = 11,321,168.26/3,881.84
  6. Step 6: Final answer
    x = 2,916.44

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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.