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Finding the Fourth Proportional to 1,391.09, 2,087.19 and 570.11

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Solution

The fourth proportional to 1,391.09, 2,087.19 and 570.11 is: 855.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.09 : 2,087.19 = 570.11 : x
  2. Step 2: Convert to fraction form
    1,391.09/2,087.19 = 570.11/x
  3. Step 3: Cross multiply
    1,391.09x = 2,087.19 × 570.11
  4. Step 4: Simplify right side
    1,391.09x = 1,189,917.45
  5. Step 5: Solve for x
    x = 1,189,917.45/1,391.09
  6. Step 6: Final answer
    x = 855.39

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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.