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Finding the Fourth Proportional to 418.64, 577.42 and 308.12

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Solution

The fourth proportional to 418.64, 577.42 and 308.12 is: 424.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.64 : 577.42 = 308.12 : x
  2. Step 2: Convert to fraction form
    418.64/577.42 = 308.12/x
  3. Step 3: Cross multiply
    418.64x = 577.42 × 308.12
  4. Step 4: Simplify right side
    418.64x = 177,914.65
  5. Step 5: Solve for x
    x = 177,914.65/418.64
  6. Step 6: Final answer
    x = 424.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.