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Finding the Fourth Proportional to 1,313.89, 1,813.21 and 724.47

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Solution

The fourth proportional to 1,313.89, 1,813.21 and 724.47 is: 999.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.89 : 1,813.21 = 724.47 : x
  2. Step 2: Convert to fraction form
    1,313.89/1,813.21 = 724.47/x
  3. Step 3: Cross multiply
    1,313.89x = 1,813.21 × 724.47
  4. Step 4: Simplify right side
    1,313.89x = 1,313,616.25
  5. Step 5: Solve for x
    x = 1,313,616.25/1,313.89
  6. Step 6: Final answer
    x = 999.79

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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.