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Finding the Fourth Proportional to 418.40, 626.84 and 253.56

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Solution

The fourth proportional to 418.40, 626.84 and 253.56 is: 379.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.40 : 626.84 = 253.56 : x
  2. Step 2: Convert to fraction form
    418.40/626.84 = 253.56/x
  3. Step 3: Cross multiply
    418.40x = 626.84 × 253.56
  4. Step 4: Simplify right side
    418.40x = 158,941.55
  5. Step 5: Solve for x
    x = 158,941.55/418.40
  6. Step 6: Final answer
    x = 379.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.