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Finding the Fourth Proportional to 1,313.72, 1,812.87 and 754.13

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Solution

The fourth proportional to 1,313.72, 1,812.87 and 754.13 is: 1,040.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.72 : 1,812.87 = 754.13 : x
  2. Step 2: Convert to fraction form
    1,313.72/1,812.87 = 754.13/x
  3. Step 3: Cross multiply
    1,313.72x = 1,812.87 × 754.13
  4. Step 4: Simplify right side
    1,313.72x = 1,367,144.19
  5. Step 5: Solve for x
    x = 1,367,144.19/1,313.72
  6. Step 6: Final answer
    x = 1,040.67

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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.