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Finding the Fourth Proportional to 259,290.40, 388,906.80 and 212,461.60

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Solution

The fourth proportional to 259,290.40, 388,906.80 and 212,461.60 is: 318,668.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,290.40 : 388,906.80 = 212,461.60 : x
  2. Step 2: Convert to fraction form
    259,290.40/388,906.80 = 212,461.60/x
  3. Step 3: Cross multiply
    259,290.40x = 388,906.80 × 212,461.60
  4. Step 4: Simplify right side
    259,290.40x = 82,627,760,978.88
  5. Step 5: Solve for x
    x = 82,627,760,978.88/259,290.40
  6. Step 6: Final answer
    x = 318,668.80

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1.5x scale

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.