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Finding the Fourth Proportional to 1,313.22, 1,812.24 and 723.78

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Solution

The fourth proportional to 1,313.22, 1,812.24 and 723.78 is: 998.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.22 : 1,812.24 = 723.78 : x
  2. Step 2: Convert to fraction form
    1,313.22/1,812.24 = 723.78/x
  3. Step 3: Cross multiply
    1,313.22x = 1,812.24 × 723.78
  4. Step 4: Simplify right side
    1,313.22x = 1,311,663.07
  5. Step 5: Solve for x
    x = 1,311,663.07/1,313.22
  6. Step 6: Final answer
    x = 998.81

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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.