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Finding the Fourth Proportional to 418.98, 578.19 and 253.16

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Solution

The fourth proportional to 418.98, 578.19 and 253.16 is: 349.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.98 : 578.19 = 253.16 : x
  2. Step 2: Convert to fraction form
    418.98/578.19 = 253.16/x
  3. Step 3: Cross multiply
    418.98x = 578.19 × 253.16
  4. Step 4: Simplify right side
    418.98x = 146,371.69
  5. Step 5: Solve for x
    x = 146,371.69/418.98
  6. Step 6: Final answer
    x = 349.35

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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.