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Finding the Fourth Proportional to 811.68, 1,120 and 480.04

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Solution

The fourth proportional to 811.68, 1,120 and 480.04 is: 662.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.68 : 1,120 = 480.04 : x
  2. Step 2: Convert to fraction form
    811.68/1,120 = 480.04/x
  3. Step 3: Cross multiply
    811.68x = 1,120 × 480.04
  4. Step 4: Simplify right side
    811.68x = 537,644.80
  5. Step 5: Solve for x
    x = 537,644.80/811.68
  6. Step 6: Final answer
    x = 662.39

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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.