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Finding the Fourth Proportional to 405.79, 608.91 and 189.37

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Solution

The fourth proportional to 405.79, 608.91 and 189.37 is: 284.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.79 : 608.91 = 189.37 : x
  2. Step 2: Convert to fraction form
    405.79/608.91 = 189.37/x
  3. Step 3: Cross multiply
    405.79x = 608.91 × 189.37
  4. Step 4: Simplify right side
    405.79x = 115,307.76
  5. Step 5: Solve for x
    x = 115,307.76/405.79
  6. Step 6: Final answer
    x = 284.16

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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.