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Finding the Fourth Proportional to 838.22, 1,156.62 and 465.20

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Solution

The fourth proportional to 838.22, 1,156.62 and 465.20 is: 641.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.22 : 1,156.62 = 465.20 : x
  2. Step 2: Convert to fraction form
    838.22/1,156.62 = 465.20/x
  3. Step 3: Cross multiply
    838.22x = 1,156.62 × 465.20
  4. Step 4: Simplify right side
    838.22x = 538,059.62
  5. Step 5: Solve for x
    x = 538,059.62/838.22
  6. Step 6: Final answer
    x = 641.91

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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.