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Finding the Fourth Proportional to 405.42, 608.67 and 391.38

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Solution

The fourth proportional to 405.42, 608.67 and 391.38 is: 587.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.42 : 608.67 = 391.38 : x
  2. Step 2: Convert to fraction form
    405.42/608.67 = 391.38/x
  3. Step 3: Cross multiply
    405.42x = 608.67 × 391.38
  4. Step 4: Simplify right side
    405.42x = 238,221.26
  5. Step 5: Solve for x
    x = 238,221.26/405.42
  6. Step 6: Final answer
    x = 587.59

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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.