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Finding the Fourth Proportional to 405.36, 604.40 and 398.07

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Solution

The fourth proportional to 405.36, 604.40 and 398.07 is: 593.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.36 : 604.40 = 398.07 : x
  2. Step 2: Convert to fraction form
    405.36/604.40 = 398.07/x
  3. Step 3: Cross multiply
    405.36x = 604.40 × 398.07
  4. Step 4: Simplify right side
    405.36x = 240,591.52
  5. Step 5: Solve for x
    x = 240,591.52/405.36
  6. Step 6: Final answer
    x = 593.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.