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Finding the Fourth Proportional to 354,420.85, 489,091.89 and 193,279

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Solution

The fourth proportional to 354,420.85, 489,091.89 and 193,279 is: 266,720.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,420.85 : 489,091.89 = 193,279 : x
  2. Step 2: Convert to fraction form
    354,420.85/489,091.89 = 193,279/x
  3. Step 3: Cross multiply
    354,420.85x = 489,091.89 × 193,279
  4. Step 4: Simplify right side
    354,420.85x = 94,531,191,407.31
  5. Step 5: Solve for x
    x = 94,531,191,407.31/354,420.85
  6. Step 6: Final answer
    x = 266,720.18

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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.