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Finding the Fourth Proportional to 1,391.56, 2,085.78 and 569.39

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Solution

The fourth proportional to 1,391.56, 2,085.78 and 569.39 is: 853.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.56 : 2,085.78 = 569.39 : x
  2. Step 2: Convert to fraction form
    1,391.56/2,085.78 = 569.39/x
  3. Step 3: Cross multiply
    1,391.56x = 2,085.78 × 569.39
  4. Step 4: Simplify right side
    1,391.56x = 1,187,615.04
  5. Step 5: Solve for x
    x = 1,187,615.04/1,391.56
  6. Step 6: Final answer
    x = 853.44

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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.