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Finding the Fourth Proportional to 821,212.30, 1,229,485.65 and 821,212.30

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Solution

The fourth proportional to 821,212.30, 1,229,485.65 and 821,212.30 is: 1,229,485.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,212.30 : 1,229,485.65 = 821,212.30 : x
  2. Step 2: Convert to fraction form
    821,212.30/1,229,485.65 = 821,212.30/x
  3. Step 3: Cross multiply
    821,212.30x = 1,229,485.65 × 821,212.30
  4. Step 4: Simplify right side
    821,212.30x = 1,009,668,738,453.50
  5. Step 5: Solve for x
    x = 1,009,668,738,453.50/821,212.30
  6. Step 6: Final answer
    x = 1,229,485.65

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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.