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Finding the Fourth Proportional to 614.36, 920 and 408.32

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Solution

The fourth proportional to 614.36, 920 and 408.32 is: 611.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.36 : 920 = 408.32 : x
  2. Step 2: Convert to fraction form
    614.36/920 = 408.32/x
  3. Step 3: Cross multiply
    614.36x = 920 × 408.32
  4. Step 4: Simplify right side
    614.36x = 375,654.40
  5. Step 5: Solve for x
    x = 375,654.40/614.36
  6. Step 6: Final answer
    x = 611.46

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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.