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Finding the Fourth Proportional to 212,906.09, 319,359.20 and 86,615.05

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Solution

The fourth proportional to 212,906.09, 319,359.20 and 86,615.05 is: 129,922.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,906.09 : 319,359.20 = 86,615.05 : x
  2. Step 2: Convert to fraction form
    212,906.09/319,359.20 = 86,615.05/x
  3. Step 3: Cross multiply
    212,906.09x = 319,359.20 × 86,615.05
  4. Step 4: Simplify right side
    212,906.09x = 27,661,313,075.96
  5. Step 5: Solve for x
    x = 27,661,313,075.96/212,906.09
  6. Step 6: Final answer
    x = 129,922.60

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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.