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Finding the Fourth Proportional to 419.65, 630.09 and 406.33

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Solution

The fourth proportional to 419.65, 630.09 and 406.33 is: 610.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.65 : 630.09 = 406.33 : x
  2. Step 2: Convert to fraction form
    419.65/630.09 = 406.33/x
  3. Step 3: Cross multiply
    419.65x = 630.09 × 406.33
  4. Step 4: Simplify right side
    419.65x = 256,024.47
  5. Step 5: Solve for x
    x = 256,024.47/419.65
  6. Step 6: Final answer
    x = 610.09

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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.