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Finding the Fourth Proportional to 883.80, 1,323.90 and 721.80

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Solution

The fourth proportional to 883.80, 1,323.90 and 721.80 is: 1,081.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.80 : 1,323.90 = 721.80 : x
  2. Step 2: Convert to fraction form
    883.80/1,323.90 = 721.80/x
  3. Step 3: Cross multiply
    883.80x = 1,323.90 × 721.80
  4. Step 4: Simplify right side
    883.80x = 955,591.02
  5. Step 5: Solve for x
    x = 955,591.02/883.80
  6. Step 6: Final answer
    x = 1,081.23

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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.