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Finding the Fourth Proportional to 842.02, 1,161.42 and 645.19

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Solution

The fourth proportional to 842.02, 1,161.42 and 645.19 is: 889.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.02 : 1,161.42 = 645.19 : x
  2. Step 2: Convert to fraction form
    842.02/1,161.42 = 645.19/x
  3. Step 3: Cross multiply
    842.02x = 1,161.42 × 645.19
  4. Step 4: Simplify right side
    842.02x = 749,336.57
  5. Step 5: Solve for x
    x = 749,336.57/842.02
  6. Step 6: Final answer
    x = 889.93

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Double scale
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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.