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Finding the Fourth Proportional to 405.96, 559.62 and 356.76

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Solution

The fourth proportional to 405.96, 559.62 and 356.76 is: 491.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.96 : 559.62 = 356.76 : x
  2. Step 2: Convert to fraction form
    405.96/559.62 = 356.76/x
  3. Step 3: Cross multiply
    405.96x = 559.62 × 356.76
  4. Step 4: Simplify right side
    405.96x = 199,650.03
  5. Step 5: Solve for x
    x = 199,650.03/405.96
  6. Step 6: Final answer
    x = 491.80

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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.