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Finding the Fourth Proportional to 418.88, 578.09 and 253.17

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Solution

The fourth proportional to 418.88, 578.09 and 253.17 is: 349.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.88 : 578.09 = 253.17 : x
  2. Step 2: Convert to fraction form
    418.88/578.09 = 253.17/x
  3. Step 3: Cross multiply
    418.88x = 578.09 × 253.17
  4. Step 4: Simplify right side
    418.88x = 146,355.05
  5. Step 5: Solve for x
    x = 146,355.05/418.88
  6. Step 6: Final answer
    x = 349.40

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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.