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Finding the Fourth Proportional to 405.39, 608.10 and 116.85

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Solution

The fourth proportional to 405.39, 608.10 and 116.85 is: 175.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.39 : 608.10 = 116.85 : x
  2. Step 2: Convert to fraction form
    405.39/608.10 = 116.85/x
  3. Step 3: Cross multiply
    405.39x = 608.10 × 116.85
  4. Step 4: Simplify right side
    405.39x = 71,056.49
  5. Step 5: Solve for x
    x = 71,056.49/405.39
  6. Step 6: Final answer
    x = 175.28

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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.