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Finding the Fourth Proportional to 3,780.90, 5,220.18 and 2,895.12

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Solution

The fourth proportional to 3,780.90, 5,220.18 and 2,895.12 is: 3,997.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,780.90 : 5,220.18 = 2,895.12 : x
  2. Step 2: Convert to fraction form
    3,780.90/5,220.18 = 2,895.12/x
  3. Step 3: Cross multiply
    3,780.90x = 5,220.18 × 2,895.12
  4. Step 4: Simplify right side
    3,780.90x = 15,113,047.52
  5. Step 5: Solve for x
    x = 15,113,047.52/3,780.90
  6. Step 6: Final answer
    x = 3,997.21

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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.