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Finding the Fourth Proportional to 2,485.26, 3,728.30 and 842.00

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Solution

The fourth proportional to 2,485.26, 3,728.30 and 842.00 is: 1,263.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,485.26 : 3,728.30 = 842.00 : x
  2. Step 2: Convert to fraction form
    2,485.26/3,728.30 = 842.00/x
  3. Step 3: Cross multiply
    2,485.26x = 3,728.30 × 842.00
  4. Step 4: Simplify right side
    2,485.26x = 3,139,205.75
  5. Step 5: Solve for x
    x = 3,139,205.75/2,485.26
  6. Step 6: Final answer
    x = 1,263.13

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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.