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Finding the Fourth Proportional to 414.40, 621.60 and 284.80

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Solution

The fourth proportional to 414.40, 621.60 and 284.80 is: 427.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.40 : 621.60 = 284.80 : x
  2. Step 2: Convert to fraction form
    414.40/621.60 = 284.80/x
  3. Step 3: Cross multiply
    414.40x = 621.60 × 284.80
  4. Step 4: Simplify right side
    414.40x = 177,031.68
  5. Step 5: Solve for x
    x = 177,031.68/414.40
  6. Step 6: Final answer
    x = 427.20

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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.