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Finding the Fourth Proportional to 1,313.16, 1,812.12 and 723.68

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Solution

The fourth proportional to 1,313.16, 1,812.12 and 723.68 is: 998.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.16 : 1,812.12 = 723.68 : x
  2. Step 2: Convert to fraction form
    1,313.16/1,812.12 = 723.68/x
  3. Step 3: Cross multiply
    1,313.16x = 1,812.12 × 723.68
  4. Step 4: Simplify right side
    1,313.16x = 1,311,395.00
  5. Step 5: Solve for x
    x = 1,311,395.00/1,313.16
  6. Step 6: Final answer
    x = 998.66

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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.