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Finding the Fourth Proportional to 811.52, 1,119.89 and 480.11

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Solution

The fourth proportional to 811.52, 1,119.89 and 480.11 is: 662.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.52 : 1,119.89 = 480.11 : x
  2. Step 2: Convert to fraction form
    811.52/1,119.89 = 480.11/x
  3. Step 3: Cross multiply
    811.52x = 1,119.89 × 480.11
  4. Step 4: Simplify right side
    811.52x = 537,662.39
  5. Step 5: Solve for x
    x = 537,662.39/811.52
  6. Step 6: Final answer
    x = 662.54

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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.