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Finding the Fourth Proportional to 613.13, 919.83 and 339.62

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Solution

The fourth proportional to 613.13, 919.83 and 339.62 is: 509.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.13 : 919.83 = 339.62 : x
  2. Step 2: Convert to fraction form
    613.13/919.83 = 339.62/x
  3. Step 3: Cross multiply
    613.13x = 919.83 × 339.62
  4. Step 4: Simplify right side
    613.13x = 312,392.66
  5. Step 5: Solve for x
    x = 312,392.66/613.13
  6. Step 6: Final answer
    x = 509.50

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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.