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Finding the Fourth Proportional to 613.99, 921.35 and 440.47

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Solution

The fourth proportional to 613.99, 921.35 and 440.47 is: 660.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.99 : 921.35 = 440.47 : x
  2. Step 2: Convert to fraction form
    613.99/921.35 = 440.47/x
  3. Step 3: Cross multiply
    613.99x = 921.35 × 440.47
  4. Step 4: Simplify right side
    613.99x = 405,824.83
  5. Step 5: Solve for x
    x = 405,824.83/613.99
  6. Step 6: Final answer
    x = 660.96

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Double scale
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Similar ratio
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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.