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Finding the Fourth Proportional to 414.77, 621.65 and 290.69

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Solution

The fourth proportional to 414.77, 621.65 and 290.69 is: 435.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.77 : 621.65 = 290.69 : x
  2. Step 2: Convert to fraction form
    414.77/621.65 = 290.69/x
  3. Step 3: Cross multiply
    414.77x = 621.65 × 290.69
  4. Step 4: Simplify right side
    414.77x = 180,707.44
  5. Step 5: Solve for x
    x = 180,707.44/414.77
  6. Step 6: Final answer
    x = 435.68

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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.