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Finding the Fourth Proportional to 405.97, 607.84 and 213.19

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Solution

The fourth proportional to 405.97, 607.84 and 213.19 is: 319.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.97 : 607.84 = 213.19 : x
  2. Step 2: Convert to fraction form
    405.97/607.84 = 213.19/x
  3. Step 3: Cross multiply
    405.97x = 607.84 × 213.19
  4. Step 4: Simplify right side
    405.97x = 129,583.36
  5. Step 5: Solve for x
    x = 129,583.36/405.97
  6. Step 6: Final answer
    x = 319.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.