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Finding the Fourth Proportional to 405.83, 608.67 and 385.31

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Solution

The fourth proportional to 405.83, 608.67 and 385.31 is: 577.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.83 : 608.67 = 385.31 : x
  2. Step 2: Convert to fraction form
    405.83/608.67 = 385.31/x
  3. Step 3: Cross multiply
    405.83x = 608.67 × 385.31
  4. Step 4: Simplify right side
    405.83x = 234,523.59
  5. Step 5: Solve for x
    x = 234,523.59/405.83
  6. Step 6: Final answer
    x = 577.89

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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.