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Finding the Fourth Proportional to 1,391.49, 2,087.17 and 569.56

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Solution

The fourth proportional to 1,391.49, 2,087.17 and 569.56 is: 854.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.49 : 2,087.17 = 569.56 : x
  2. Step 2: Convert to fraction form
    1,391.49/2,087.17 = 569.56/x
  3. Step 3: Cross multiply
    1,391.49x = 2,087.17 × 569.56
  4. Step 4: Simplify right side
    1,391.49x = 1,188,768.55
  5. Step 5: Solve for x
    x = 1,188,768.55/1,391.49
  6. Step 6: Final answer
    x = 854.31

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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.