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Finding the Fourth Proportional to 1,313.94, 1,813.25 and 724.50

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Solution

The fourth proportional to 1,313.94, 1,813.25 and 724.50 is: 999.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.94 : 1,813.25 = 724.50 : x
  2. Step 2: Convert to fraction form
    1,313.94/1,813.25 = 724.50/x
  3. Step 3: Cross multiply
    1,313.94x = 1,813.25 × 724.50
  4. Step 4: Simplify right side
    1,313.94x = 1,313,696.00
  5. Step 5: Solve for x
    x = 1,313,696.00/1,313.94
  6. Step 6: Final answer
    x = 999.81

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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.