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Finding the Fourth Proportional to 405.58, 608.75 and 213.34

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Solution

The fourth proportional to 405.58, 608.75 and 213.34 is: 320.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.58 : 608.75 = 213.34 : x
  2. Step 2: Convert to fraction form
    405.58/608.75 = 213.34/x
  3. Step 3: Cross multiply
    405.58x = 608.75 × 213.34
  4. Step 4: Simplify right side
    405.58x = 129,870.73
  5. Step 5: Solve for x
    x = 129,870.73/405.58
  6. Step 6: Final answer
    x = 320.21

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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.