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Finding the Fourth Proportional to 326,010.20, 489,015.30 and 139,040.60

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Solution

The fourth proportional to 326,010.20, 489,015.30 and 139,040.60 is: 208,560.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,010.20 : 489,015.30 = 139,040.60 : x
  2. Step 2: Convert to fraction form
    326,010.20/489,015.30 = 139,040.60/x
  3. Step 3: Cross multiply
    326,010.20x = 489,015.30 × 139,040.60
  4. Step 4: Simplify right side
    326,010.20x = 67,992,980,721.18
  5. Step 5: Solve for x
    x = 67,992,980,721.18/326,010.20
  6. Step 6: Final answer
    x = 208,560.90

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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.