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Finding the Fourth Proportional to 1,281,165.80, 1,921,748.70 and 809,940.20

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Solution

The fourth proportional to 1,281,165.80, 1,921,748.70 and 809,940.20 is: 1,214,910.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281,165.80 : 1,921,748.70 = 809,940.20 : x
  2. Step 2: Convert to fraction form
    1,281,165.80/1,921,748.70 = 809,940.20/x
  3. Step 3: Cross multiply
    1,281,165.80x = 1,921,748.70 × 809,940.20
  4. Step 4: Simplify right side
    1,281,165.80x = 1,556,501,526,427.74
  5. Step 5: Solve for x
    x = 1,556,501,526,427.74/1,281,165.80
  6. Step 6: Final answer
    x = 1,214,910.30

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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.