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Finding the Fourth Proportional to 613.64, 920.84 and 339.46

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Solution

The fourth proportional to 613.64, 920.84 and 339.46 is: 509.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.64 : 920.84 = 339.46 : x
  2. Step 2: Convert to fraction form
    613.64/920.84 = 339.46/x
  3. Step 3: Cross multiply
    613.64x = 920.84 × 339.46
  4. Step 4: Simplify right side
    613.64x = 312,584.35
  5. Step 5: Solve for x
    x = 312,584.35/613.64
  6. Step 6: Final answer
    x = 509.39

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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.