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Finding the Fourth Proportional to 1,243.58, 1,714.86 and 823.78

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Solution

The fourth proportional to 1,243.58, 1,714.86 and 823.78 is: 1,135.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.58 : 1,714.86 = 823.78 : x
  2. Step 2: Convert to fraction form
    1,243.58/1,714.86 = 823.78/x
  3. Step 3: Cross multiply
    1,243.58x = 1,714.86 × 823.78
  4. Step 4: Simplify right side
    1,243.58x = 1,412,662.19
  5. Step 5: Solve for x
    x = 1,412,662.19/1,243.58
  6. Step 6: Final answer
    x = 1,135.97

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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.