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Finding the Fourth Proportional to 2,485.90, 3,729.32 and 820.12

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Solution

The fourth proportional to 2,485.90, 3,729.32 and 820.12 is: 1,230.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,485.90 : 3,729.32 = 820.12 : x
  2. Step 2: Convert to fraction form
    2,485.90/3,729.32 = 820.12/x
  3. Step 3: Cross multiply
    2,485.90x = 3,729.32 × 820.12
  4. Step 4: Simplify right side
    2,485.90x = 3,058,489.92
  5. Step 5: Solve for x
    x = 3,058,489.92/2,485.90
  6. Step 6: Final answer
    x = 1,230.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.