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Finding the Fourth Proportional to 1,318,816.65, 1,978,203.36 and 420,246.12

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Solution

The fourth proportional to 1,318,816.65, 1,978,203.36 and 420,246.12 is: 630,362.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,816.65 : 1,978,203.36 = 420,246.12 : x
  2. Step 2: Convert to fraction form
    1,318,816.65/1,978,203.36 = 420,246.12/x
  3. Step 3: Cross multiply
    1,318,816.65x = 1,978,203.36 × 420,246.12
  4. Step 4: Simplify right side
    1,318,816.65x = 831,332,286,610.96
  5. Step 5: Solve for x
    x = 831,332,286,610.96/1,318,816.65
  6. Step 6: Final answer
    x = 630,362.29

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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.