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Finding the Fourth Proportional to 858.72, 1,183.92 and 637.92

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Solution

The fourth proportional to 858.72, 1,183.92 and 637.92 is: 879.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.72 : 1,183.92 = 637.92 : x
  2. Step 2: Convert to fraction form
    858.72/1,183.92 = 637.92/x
  3. Step 3: Cross multiply
    858.72x = 1,183.92 × 637.92
  4. Step 4: Simplify right side
    858.72x = 755,246.25
  5. Step 5: Solve for x
    x = 755,246.25/858.72
  6. Step 6: Final answer
    x = 879.50

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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.