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Finding the Fourth Proportional to 418.84, 578.11 and 253.17

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Solution

The fourth proportional to 418.84, 578.11 and 253.17 is: 349.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.84 : 578.11 = 253.17 : x
  2. Step 2: Convert to fraction form
    418.84/578.11 = 253.17/x
  3. Step 3: Cross multiply
    418.84x = 578.11 × 253.17
  4. Step 4: Simplify right side
    418.84x = 146,359.95
  5. Step 5: Solve for x
    x = 146,359.95/418.84
  6. Step 6: Final answer
    x = 349.44

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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.