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Finding the Fourth Proportional to 813.12, 1,120.80 and 551.52

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Solution

The fourth proportional to 813.12, 1,120.80 and 551.52 is: 760.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.12 : 1,120.80 = 551.52 : x
  2. Step 2: Convert to fraction form
    813.12/1,120.80 = 551.52/x
  3. Step 3: Cross multiply
    813.12x = 1,120.80 × 551.52
  4. Step 4: Simplify right side
    813.12x = 618,143.62
  5. Step 5: Solve for x
    x = 618,143.62/813.12
  6. Step 6: Final answer
    x = 760.21

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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.