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Finding the Fourth Proportional to 391,059, 539,661.42 and 212,211

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Solution

The fourth proportional to 391,059, 539,661.42 and 212,211 is: 292,851.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,059 : 539,661.42 = 212,211 : x
  2. Step 2: Convert to fraction form
    391,059/539,661.42 = 212,211/x
  3. Step 3: Cross multiply
    391,059x = 539,661.42 × 212,211
  4. Step 4: Simplify right side
    391,059x = 114,522,089,599.62
  5. Step 5: Solve for x
    x = 114,522,089,599.62/391,059
  6. Step 6: Final answer
    x = 292,851.18

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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.