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Finding the Fourth Proportional to 405.57, 559.90 and 316.86

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Solution

The fourth proportional to 405.57, 559.90 and 316.86 is: 437.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.57 : 559.90 = 316.86 : x
  2. Step 2: Convert to fraction form
    405.57/559.90 = 316.86/x
  3. Step 3: Cross multiply
    405.57x = 559.90 × 316.86
  4. Step 4: Simplify right side
    405.57x = 177,409.91
  5. Step 5: Solve for x
    x = 177,409.91/405.57
  6. Step 6: Final answer
    x = 437.43

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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.