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Finding the Fourth Proportional to 467.79, 645.42 and 290.71

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Solution

The fourth proportional to 467.79, 645.42 and 290.71 is: 401.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.79 : 645.42 = 290.71 : x
  2. Step 2: Convert to fraction form
    467.79/645.42 = 290.71/x
  3. Step 3: Cross multiply
    467.79x = 645.42 × 290.71
  4. Step 4: Simplify right side
    467.79x = 187,626.68
  5. Step 5: Solve for x
    x = 187,626.68/467.79
  6. Step 6: Final answer
    x = 401.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.