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Finding the Fourth Proportional to 1,391.54, 2,087.01 and 569.60

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Solution

The fourth proportional to 1,391.54, 2,087.01 and 569.60 is: 854.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.54 : 2,087.01 = 569.60 : x
  2. Step 2: Convert to fraction form
    1,391.54/2,087.01 = 569.60/x
  3. Step 3: Cross multiply
    1,391.54x = 2,087.01 × 569.60
  4. Step 4: Simplify right side
    1,391.54x = 1,188,760.90
  5. Step 5: Solve for x
    x = 1,188,760.90/1,391.54
  6. Step 6: Final answer
    x = 854.28

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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.