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Finding the Fourth Proportional to 1,318,763.70, 1,978,145.55 and 1,230,190.20

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Solution

The fourth proportional to 1,318,763.70, 1,978,145.55 and 1,230,190.20 is: 1,845,285.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,763.70 : 1,978,145.55 = 1,230,190.20 : x
  2. Step 2: Convert to fraction form
    1,318,763.70/1,978,145.55 = 1,230,190.20/x
  3. Step 3: Cross multiply
    1,318,763.70x = 1,978,145.55 × 1,230,190.20
  4. Step 4: Simplify right side
    1,318,763.70x = 2,433,495,269,783.61
  5. Step 5: Solve for x
    x = 2,433,495,269,783.61/1,318,763.70
  6. Step 6: Final answer
    x = 1,845,285.30

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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.