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Finding the Fourth Proportional to 326,394.64, 489,237.70 and 126,656.20

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Solution

The fourth proportional to 326,394.64, 489,237.70 and 126,656.20 is: 189,846.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,394.64 : 489,237.70 = 126,656.20 : x
  2. Step 2: Convert to fraction form
    326,394.64/489,237.70 = 126,656.20/x
  3. Step 3: Cross multiply
    326,394.64x = 489,237.70 × 126,656.20
  4. Step 4: Simplify right side
    326,394.64x = 61,964,987,978.74
  5. Step 5: Solve for x
    x = 61,964,987,978.74/326,394.64
  6. Step 6: Final answer
    x = 189,846.83

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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.