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Finding the Fourth Proportional to 413,405.80, 620,108.70 and 385,412.20

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Solution

The fourth proportional to 413,405.80, 620,108.70 and 385,412.20 is: 578,118.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    413,405.80 : 620,108.70 = 385,412.20 : x
  2. Step 2: Convert to fraction form
    413,405.80/620,108.70 = 385,412.20/x
  3. Step 3: Cross multiply
    413,405.80x = 620,108.70 × 385,412.20
  4. Step 4: Simplify right side
    413,405.80x = 238,997,458,306.14
  5. Step 5: Solve for x
    x = 238,997,458,306.14/413,405.80
  6. Step 6: Final answer
    x = 578,118.30

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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.