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Finding the Fourth Proportional to 354,478.37, 489,343.97 and 218,536.61

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Solution

The fourth proportional to 354,478.37, 489,343.97 and 218,536.61 is: 301,681.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,478.37 : 489,343.97 = 218,536.61 : x
  2. Step 2: Convert to fraction form
    354,478.37/489,343.97 = 218,536.61/x
  3. Step 3: Cross multiply
    354,478.37x = 489,343.97 × 218,536.61
  4. Step 4: Simplify right side
    354,478.37x = 106,939,571,235.06
  5. Step 5: Solve for x
    x = 106,939,571,235.06/354,478.37
  6. Step 6: Final answer
    x = 301,681.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.