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Finding the Fourth Proportional to 1,245.60, 1,728.25 and 1,235.00

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Solution

The fourth proportional to 1,245.60, 1,728.25 and 1,235.00 is: 1,713.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.60 : 1,728.25 = 1,235.00 : x
  2. Step 2: Convert to fraction form
    1,245.60/1,728.25 = 1,235.00/x
  3. Step 3: Cross multiply
    1,245.60x = 1,728.25 × 1,235.00
  4. Step 4: Simplify right side
    1,245.60x = 2,134,389.98
  5. Step 5: Solve for x
    x = 2,134,389.98/1,245.60
  6. Step 6: Final answer
    x = 1,713.54

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.