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Finding the Fourth Proportional to 1,313.49, 1,811.97 and 816.70

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Solution

The fourth proportional to 1,313.49, 1,811.97 and 816.70 is: 1,126.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.49 : 1,811.97 = 816.70 : x
  2. Step 2: Convert to fraction form
    1,313.49/1,811.97 = 816.70/x
  3. Step 3: Cross multiply
    1,313.49x = 1,811.97 × 816.70
  4. Step 4: Simplify right side
    1,313.49x = 1,479,835.90
  5. Step 5: Solve for x
    x = 1,479,835.90/1,313.49
  6. Step 6: Final answer
    x = 1,126.64

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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.