Home / 1,313.31-1,812.30-723.80

Finding the Fourth Proportional to 1,313.31, 1,812.30 and 723.80

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Solution

The fourth proportional to 1,313.31, 1,812.30 and 723.80 is: 998.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.31 : 1,812.30 = 723.80 : x
  2. Step 2: Convert to fraction form
    1,313.31/1,812.30 = 723.80/x
  3. Step 3: Cross multiply
    1,313.31x = 1,812.30 × 723.80
  4. Step 4: Simplify right side
    1,313.31x = 1,311,737.76
  5. Step 5: Solve for x
    x = 1,311,737.76/1,313.31
  6. Step 6: Final answer
    x = 998.80

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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.