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Finding the Fourth Proportional to 842.16, 1,161.57 and 645.33

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Solution

The fourth proportional to 842.16, 1,161.57 and 645.33 is: 890.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.16 : 1,161.57 = 645.33 : x
  2. Step 2: Convert to fraction form
    842.16/1,161.57 = 645.33/x
  3. Step 3: Cross multiply
    842.16x = 1,161.57 × 645.33
  4. Step 4: Simplify right side
    842.16x = 749,595.97
  5. Step 5: Solve for x
    x = 749,595.97/842.16
  6. Step 6: Final answer
    x = 890.09

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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.