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Finding the Fourth Proportional to 326,440.82, 489,604.80 and 86,556.26

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Solution

The fourth proportional to 326,440.82, 489,604.80 and 86,556.26 is: 129,819.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,440.82 : 489,604.80 = 86,556.26 : x
  2. Step 2: Convert to fraction form
    326,440.82/489,604.80 = 86,556.26/x
  3. Step 3: Cross multiply
    326,440.82x = 489,604.80 × 86,556.26
  4. Step 4: Simplify right side
    326,440.82x = 42,378,360,366.05
  5. Step 5: Solve for x
    x = 42,378,360,366.05/326,440.82
  6. Step 6: Final answer
    x = 129,819.43

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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.