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Finding the Fourth Proportional to 1,313.99, 1,813.31 and 724.51

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Solution

The fourth proportional to 1,313.99, 1,813.31 and 724.51 is: 999.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.99 : 1,813.31 = 724.51 : x
  2. Step 2: Convert to fraction form
    1,313.99/1,813.31 = 724.51/x
  3. Step 3: Cross multiply
    1,313.99x = 1,813.31 × 724.51
  4. Step 4: Simplify right side
    1,313.99x = 1,313,761.23
  5. Step 5: Solve for x
    x = 1,313,761.23/1,313.99
  6. Step 6: Final answer
    x = 999.83

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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.