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Finding the Fourth Proportional to 613.44, 920.17 and 339.39

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Solution

The fourth proportional to 613.44, 920.17 and 339.39 is: 509.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.44 : 920.17 = 339.39 : x
  2. Step 2: Convert to fraction form
    613.44/920.17 = 339.39/x
  3. Step 3: Cross multiply
    613.44x = 920.17 × 339.39
  4. Step 4: Simplify right side
    613.44x = 312,291.90
  5. Step 5: Solve for x
    x = 312,291.90/613.44
  6. Step 6: Final answer
    x = 509.09

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.