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Finding the Fourth Proportional to 858.07, 1,183.29 and 691.75

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Solution

The fourth proportional to 858.07, 1,183.29 and 691.75 is: 953.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.07 : 1,183.29 = 691.75 : x
  2. Step 2: Convert to fraction form
    858.07/1,183.29 = 691.75/x
  3. Step 3: Cross multiply
    858.07x = 1,183.29 × 691.75
  4. Step 4: Simplify right side
    858.07x = 818,540.86
  5. Step 5: Solve for x
    x = 818,540.86/858.07
  6. Step 6: Final answer
    x = 953.93

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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.