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Finding the Fourth Proportional to 613.36, 920.40 and 418.30

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Solution

The fourth proportional to 613.36, 920.40 and 418.30 is: 627.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.36 : 920.40 = 418.30 : x
  2. Step 2: Convert to fraction form
    613.36/920.40 = 418.30/x
  3. Step 3: Cross multiply
    613.36x = 920.40 × 418.30
  4. Step 4: Simplify right side
    613.36x = 385,003.32
  5. Step 5: Solve for x
    x = 385,003.32/613.36
  6. Step 6: Final answer
    x = 627.70

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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.