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Finding the Fourth Proportional to 1,212,799.80, 1,819,199.70 and 858,214.20

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Solution

The fourth proportional to 1,212,799.80, 1,819,199.70 and 858,214.20 is: 1,287,321.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212,799.80 : 1,819,199.70 = 858,214.20 : x
  2. Step 2: Convert to fraction form
    1,212,799.80/1,819,199.70 = 858,214.20/x
  3. Step 3: Cross multiply
    1,212,799.80x = 1,819,199.70 × 858,214.20
  4. Step 4: Simplify right side
    1,212,799.80x = 1,561,263,015,175.74
  5. Step 5: Solve for x
    x = 1,561,263,015,175.74/1,212,799.80
  6. Step 6: Final answer
    x = 1,287,321.30

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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.