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Finding the Fourth Proportional to 2,612,788.81, 3,918,803.05 and 815,254.09

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Solution

The fourth proportional to 2,612,788.81, 3,918,803.05 and 815,254.09 is: 1,222,762.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612,788.81 : 3,918,803.05 = 815,254.09 : x
  2. Step 2: Convert to fraction form
    2,612,788.81/3,918,803.05 = 815,254.09/x
  3. Step 3: Cross multiply
    2,612,788.81x = 3,918,803.05 × 815,254.09
  4. Step 4: Simplify right side
    2,612,788.81x = 3,194,820,214,416.97
  5. Step 5: Solve for x
    x = 3,194,820,214,416.97/2,612,788.81
  6. Step 6: Final answer
    x = 1,222,762.51

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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.