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Finding the Fourth Proportional to 405.74, 608.85 and 189.34

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Solution

The fourth proportional to 405.74, 608.85 and 189.34 is: 284.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.74 : 608.85 = 189.34 : x
  2. Step 2: Convert to fraction form
    405.74/608.85 = 189.34/x
  3. Step 3: Cross multiply
    405.74x = 608.85 × 189.34
  4. Step 4: Simplify right side
    405.74x = 115,278.14
  5. Step 5: Solve for x
    x = 115,278.14/405.74
  6. Step 6: Final answer
    x = 284.12

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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.