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Finding the Fourth Proportional to 1,245.95, 1,719.05 and 773.72

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Solution

The fourth proportional to 1,245.95, 1,719.05 and 773.72 is: 1,067.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.95 : 1,719.05 = 773.72 : x
  2. Step 2: Convert to fraction form
    1,245.95/1,719.05 = 773.72/x
  3. Step 3: Cross multiply
    1,245.95x = 1,719.05 × 773.72
  4. Step 4: Simplify right side
    1,245.95x = 1,330,050.90
  5. Step 5: Solve for x
    x = 1,330,050.90/1,245.95
  6. Step 6: Final answer
    x = 1,067.50

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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.