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Finding the Fourth Proportional to 405.63, 559.79 and 239.99

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Solution

The fourth proportional to 405.63, 559.79 and 239.99 is: 331.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.63 : 559.79 = 239.99 : x
  2. Step 2: Convert to fraction form
    405.63/559.79 = 239.99/x
  3. Step 3: Cross multiply
    405.63x = 559.79 × 239.99
  4. Step 4: Simplify right side
    405.63x = 134,341.80
  5. Step 5: Solve for x
    x = 134,341.80/405.63
  6. Step 6: Final answer
    x = 331.19

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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.