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Finding the Fourth Proportional to 418.56, 627.80 and 212.98

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Solution

The fourth proportional to 418.56, 627.80 and 212.98 is: 319.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.56 : 627.80 = 212.98 : x
  2. Step 2: Convert to fraction form
    418.56/627.80 = 212.98/x
  3. Step 3: Cross multiply
    418.56x = 627.80 × 212.98
  4. Step 4: Simplify right side
    418.56x = 133,708.84
  5. Step 5: Solve for x
    x = 133,708.84/418.56
  6. Step 6: Final answer
    x = 319.45

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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.