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Finding the Fourth Proportional to 1,245.86, 1,719.40 and 825.50

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Solution

The fourth proportional to 1,245.86, 1,719.40 and 825.50 is: 1,139.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.86 : 1,719.40 = 825.50 : x
  2. Step 2: Convert to fraction form
    1,245.86/1,719.40 = 825.50/x
  3. Step 3: Cross multiply
    1,245.86x = 1,719.40 × 825.50
  4. Step 4: Simplify right side
    1,245.86x = 1,419,364.70
  5. Step 5: Solve for x
    x = 1,419,364.70/1,245.86
  6. Step 6: Final answer
    x = 1,139.27

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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.