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Finding the Fourth Proportional to 1,313.73, 1,969.20 and 436

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Solution

The fourth proportional to 1,313.73, 1,969.20 and 436 is: 653.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.73 : 1,969.20 = 436 : x
  2. Step 2: Convert to fraction form
    1,313.73/1,969.20 = 436/x
  3. Step 3: Cross multiply
    1,313.73x = 1,969.20 × 436
  4. Step 4: Simplify right side
    1,313.73x = 858,571.20
  5. Step 5: Solve for x
    x = 858,571.20/1,313.73
  6. Step 6: Final answer
    x = 653.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.