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Finding the Fourth Proportional to 874.06, 1,205.48 and 637.74

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Solution

The fourth proportional to 874.06, 1,205.48 and 637.74 is: 879.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.06 : 1,205.48 = 637.74 : x
  2. Step 2: Convert to fraction form
    874.06/1,205.48 = 637.74/x
  3. Step 3: Cross multiply
    874.06x = 1,205.48 × 637.74
  4. Step 4: Simplify right side
    874.06x = 768,784.41
  5. Step 5: Solve for x
    x = 768,784.41/874.06
  6. Step 6: Final answer
    x = 879.56

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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.