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Finding the Fourth Proportional to 406.71, 611.41 and 315.45

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Solution

The fourth proportional to 406.71, 611.41 and 315.45 is: 474.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.71 : 611.41 = 315.45 : x
  2. Step 2: Convert to fraction form
    406.71/611.41 = 315.45/x
  3. Step 3: Cross multiply
    406.71x = 611.41 × 315.45
  4. Step 4: Simplify right side
    406.71x = 192,865.44
  5. Step 5: Solve for x
    x = 192,865.44/406.71
  6. Step 6: Final answer
    x = 474.21

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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.