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Finding the Fourth Proportional to 857.74, 1,183.74 and 484.75

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Solution

The fourth proportional to 857.74, 1,183.74 and 484.75 is: 668.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.74 : 1,183.74 = 484.75 : x
  2. Step 2: Convert to fraction form
    857.74/1,183.74 = 484.75/x
  3. Step 3: Cross multiply
    857.74x = 1,183.74 × 484.75
  4. Step 4: Simplify right side
    857.74x = 573,814.06
  5. Step 5: Solve for x
    x = 573,814.06/857.74
  6. Step 6: Final answer
    x = 668.99

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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.