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Finding the Fourth Proportional to 842.83, 1,163.03 and 621.90

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Solution

The fourth proportional to 842.83, 1,163.03 and 621.90 is: 858.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.83 : 1,163.03 = 621.90 : x
  2. Step 2: Convert to fraction form
    842.83/1,163.03 = 621.90/x
  3. Step 3: Cross multiply
    842.83x = 1,163.03 × 621.90
  4. Step 4: Simplify right side
    842.83x = 723,285.25
  5. Step 5: Solve for x
    x = 723,285.25/842.83
  6. Step 6: Final answer
    x = 858.17

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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.