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Finding the Fourth Proportional to 418.26, 623.98 and 412.80

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Solution

The fourth proportional to 418.26, 623.98 and 412.80 is: 615.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.26 : 623.98 = 412.80 : x
  2. Step 2: Convert to fraction form
    418.26/623.98 = 412.80/x
  3. Step 3: Cross multiply
    418.26x = 623.98 × 412.80
  4. Step 4: Simplify right side
    418.26x = 257,575.96
  5. Step 5: Solve for x
    x = 257,575.96/418.26
  6. Step 6: Final answer
    x = 615.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.