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Finding the Fourth Proportional to 1,321.73, 1,823.93 and 724.22

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Solution

The fourth proportional to 1,321.73, 1,823.93 and 724.22 is: 999.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.73 : 1,823.93 = 724.22 : x
  2. Step 2: Convert to fraction form
    1,321.73/1,823.93 = 724.22/x
  3. Step 3: Cross multiply
    1,321.73x = 1,823.93 × 724.22
  4. Step 4: Simplify right side
    1,321.73x = 1,320,919.28
  5. Step 5: Solve for x
    x = 1,320,919.28/1,321.73
  6. Step 6: Final answer
    x = 999.39

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1.5x scale

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.