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Finding the Fourth Proportional to 811.94, 1,120.64 and 480.35

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Solution

The fourth proportional to 811.94, 1,120.64 and 480.35 is: 662.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.94 : 1,120.64 = 480.35 : x
  2. Step 2: Convert to fraction form
    811.94/1,120.64 = 480.35/x
  3. Step 3: Cross multiply
    811.94x = 1,120.64 × 480.35
  4. Step 4: Simplify right side
    811.94x = 538,299.42
  5. Step 5: Solve for x
    x = 538,299.42/811.94
  6. Step 6: Final answer
    x = 662.98

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.