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Finding the Fourth Proportional to 1,245.26, 1,718.44 and 685.75

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Solution

The fourth proportional to 1,245.26, 1,718.44 and 685.75 is: 946.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.26 : 1,718.44 = 685.75 : x
  2. Step 2: Convert to fraction form
    1,245.26/1,718.44 = 685.75/x
  3. Step 3: Cross multiply
    1,245.26x = 1,718.44 × 685.75
  4. Step 4: Simplify right side
    1,245.26x = 1,178,420.23
  5. Step 5: Solve for x
    x = 1,178,420.23/1,245.26
  6. Step 6: Final answer
    x = 946.32

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1.5x scale

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.