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Finding the Fourth Proportional to 418.68, 627.90 and 256.20

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Solution

The fourth proportional to 418.68, 627.90 and 256.20 is: 384.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.68 : 627.90 = 256.20 : x
  2. Step 2: Convert to fraction form
    418.68/627.90 = 256.20/x
  3. Step 3: Cross multiply
    418.68x = 627.90 × 256.20
  4. Step 4: Simplify right side
    418.68x = 160,867.98
  5. Step 5: Solve for x
    x = 160,867.98/418.68
  6. Step 6: Final answer
    x = 384.23

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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.