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Finding the Fourth Proportional to 405.69, 559.22 and 356.49

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Solution

The fourth proportional to 405.69, 559.22 and 356.49 is: 491.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.69 : 559.22 = 356.49 : x
  2. Step 2: Convert to fraction form
    405.69/559.22 = 356.49/x
  3. Step 3: Cross multiply
    405.69x = 559.22 × 356.49
  4. Step 4: Simplify right side
    405.69x = 199,354.56
  5. Step 5: Solve for x
    x = 199,354.56/405.69
  6. Step 6: Final answer
    x = 491.40

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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.