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Finding the Fourth Proportional to 856.97, 1,183.74 and 691.80

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Solution

The fourth proportional to 856.97, 1,183.74 and 691.80 is: 955.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.97 : 1,183.74 = 691.80 : x
  2. Step 2: Convert to fraction form
    856.97/1,183.74 = 691.80/x
  3. Step 3: Cross multiply
    856.97x = 1,183.74 × 691.80
  4. Step 4: Simplify right side
    856.97x = 818,904.30
  5. Step 5: Solve for x
    x = 818,904.30/856.97
  6. Step 6: Final answer
    x = 955.58

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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.