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Finding the Fourth Proportional to 406.71, 561.33 and 393.98

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Solution

The fourth proportional to 406.71, 561.33 and 393.98 is: 543.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.71 : 561.33 = 393.98 : x
  2. Step 2: Convert to fraction form
    406.71/561.33 = 393.98/x
  3. Step 3: Cross multiply
    406.71x = 561.33 × 393.98
  4. Step 4: Simplify right side
    406.71x = 221,149.99
  5. Step 5: Solve for x
    x = 221,149.99/406.71
  6. Step 6: Final answer
    x = 543.75

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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.