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Finding the Fourth Proportional to 326,658, 489,987 and 105,042

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Solution

The fourth proportional to 326,658, 489,987 and 105,042 is: 157,563

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,658 : 489,987 = 105,042 : x
  2. Step 2: Convert to fraction form
    326,658/489,987 = 105,042/x
  3. Step 3: Cross multiply
    326,658x = 489,987 × 105,042
  4. Step 4: Simplify right side
    326,658x = 51,469,214,454
  5. Step 5: Solve for x
    x = 51,469,214,454/326,658
  6. Step 6: Final answer
    x = 157,563

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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.