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Finding the Fourth Proportional to 406.99, 561.34 and 282.65

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Solution

The fourth proportional to 406.99, 561.34 and 282.65 is: 389.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.99 : 561.34 = 282.65 : x
  2. Step 2: Convert to fraction form
    406.99/561.34 = 282.65/x
  3. Step 3: Cross multiply
    406.99x = 561.34 × 282.65
  4. Step 4: Simplify right side
    406.99x = 158,662.75
  5. Step 5: Solve for x
    x = 158,662.75/406.99
  6. Step 6: Final answer
    x = 389.84

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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.