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Finding the Fourth Proportional to 391,059.56, 539,662.20 and 212,211.56

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Solution

The fourth proportional to 391,059.56, 539,662.20 and 212,211.56 is: 292,851.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,059.56 : 539,662.20 = 212,211.56 : x
  2. Step 2: Convert to fraction form
    391,059.56/539,662.20 = 212,211.56/x
  3. Step 3: Cross multiply
    391,059.56x = 539,662.20 × 212,211.56
  4. Step 4: Simplify right side
    391,059.56x = 114,522,557,888.39
  5. Step 5: Solve for x
    x = 114,522,557,888.39/391,059.56
  6. Step 6: Final answer
    x = 292,851.96

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1.5x scale

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.