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Finding the Fourth Proportional to 326,403.90, 489,507.36 and 126,679.74

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Solution

The fourth proportional to 326,403.90, 489,507.36 and 126,679.74 is: 189,981.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,403.90 : 489,507.36 = 126,679.74 : x
  2. Step 2: Convert to fraction form
    326,403.90/489,507.36 = 126,679.74/x
  3. Step 3: Cross multiply
    326,403.90x = 489,507.36 × 126,679.74
  4. Step 4: Simplify right side
    326,403.90x = 62,010,665,092.89
  5. Step 5: Solve for x
    x = 62,010,665,092.89/326,403.90
  6. Step 6: Final answer
    x = 189,981.39

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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.