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Finding the Fourth Proportional to 3,890.90, 5,865.09 and 3,665.18

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Solution

The fourth proportional to 3,890.90, 5,865.09 and 3,665.18 is: 5,524.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.90 : 5,865.09 = 3,665.18 : x
  2. Step 2: Convert to fraction form
    3,890.90/5,865.09 = 3,665.18/x
  3. Step 3: Cross multiply
    3,890.90x = 5,865.09 × 3,665.18
  4. Step 4: Simplify right side
    3,890.90x = 21,496,581.24
  5. Step 5: Solve for x
    x = 21,496,581.24/3,890.90
  6. Step 6: Final answer
    x = 5,524.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.