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Finding the Fourth Proportional to 413,426.80, 620,140.20 and 385,433.20

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Solution

The fourth proportional to 413,426.80, 620,140.20 and 385,433.20 is: 578,149.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    413,426.80 : 620,140.20 = 385,433.20 : x
  2. Step 2: Convert to fraction form
    413,426.80/620,140.20 = 385,433.20/x
  3. Step 3: Cross multiply
    413,426.80x = 620,140.20 × 385,433.20
  4. Step 4: Simplify right side
    413,426.80x = 239,022,621,734.64
  5. Step 5: Solve for x
    x = 239,022,621,734.64/413,426.80
  6. Step 6: Final answer
    x = 578,149.80

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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.