Home / 1,318,786.77-1,978,158.45-420,216.36

Finding the Fourth Proportional to 1,318,786.77, 1,978,158.45 and 420,216.36

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Solution

The fourth proportional to 1,318,786.77, 1,978,158.45 and 420,216.36 is: 630,317.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,786.77 : 1,978,158.45 = 420,216.36 : x
  2. Step 2: Convert to fraction form
    1,318,786.77/1,978,158.45 = 420,216.36/x
  3. Step 3: Cross multiply
    1,318,786.77x = 1,978,158.45 × 420,216.36
  4. Step 4: Simplify right side
    1,318,786.77x = 831,254,543,362.24
  5. Step 5: Solve for x
    x = 831,254,543,362.24/1,318,786.77
  6. Step 6: Final answer
    x = 630,317.62

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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.