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Finding the Fourth Proportional to 838.20, 1,256.79 and 375.89

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Solution

The fourth proportional to 838.20, 1,256.79 and 375.89 is: 563.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.20 : 1,256.79 = 375.89 : x
  2. Step 2: Convert to fraction form
    838.20/1,256.79 = 375.89/x
  3. Step 3: Cross multiply
    838.20x = 1,256.79 × 375.89
  4. Step 4: Simplify right side
    838.20x = 472,417.94
  5. Step 5: Solve for x
    x = 472,417.94/838.20
  6. Step 6: Final answer
    x = 563.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.