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Finding the Fourth Proportional to 414.66, 620.78 and 290.84

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Solution

The fourth proportional to 414.66, 620.78 and 290.84 is: 435.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.66 : 620.78 = 290.84 : x
  2. Step 2: Convert to fraction form
    414.66/620.78 = 290.84/x
  3. Step 3: Cross multiply
    414.66x = 620.78 × 290.84
  4. Step 4: Simplify right side
    414.66x = 180,543.10
  5. Step 5: Solve for x
    x = 180,543.10/414.66
  6. Step 6: Final answer
    x = 435.40

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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.