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Finding the Fourth Proportional to 856.57, 1,183.23 and 636.67

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Solution

The fourth proportional to 856.57, 1,183.23 and 636.67 is: 879.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.57 : 1,183.23 = 636.67 : x
  2. Step 2: Convert to fraction form
    856.57/1,183.23 = 636.67/x
  3. Step 3: Cross multiply
    856.57x = 1,183.23 × 636.67
  4. Step 4: Simplify right side
    856.57x = 753,327.04
  5. Step 5: Solve for x
    x = 753,327.04/856.57
  6. Step 6: Final answer
    x = 879.47

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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.