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Finding the Fourth Proportional to 838.22, 1,156.85 and 488.91

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Solution

The fourth proportional to 838.22, 1,156.85 and 488.91 is: 674.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.22 : 1,156.85 = 488.91 : x
  2. Step 2: Convert to fraction form
    838.22/1,156.85 = 488.91/x
  3. Step 3: Cross multiply
    838.22x = 1,156.85 × 488.91
  4. Step 4: Simplify right side
    838.22x = 565,593.09
  5. Step 5: Solve for x
    x = 565,593.09/838.22
  6. Step 6: Final answer
    x = 674.76

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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.