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Finding the Fourth Proportional to 1,571.21, 2,354.97 and 646.31

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Solution

The fourth proportional to 1,571.21, 2,354.97 and 646.31 is: 968.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.21 : 2,354.97 = 646.31 : x
  2. Step 2: Convert to fraction form
    1,571.21/2,354.97 = 646.31/x
  3. Step 3: Cross multiply
    1,571.21x = 2,354.97 × 646.31
  4. Step 4: Simplify right side
    1,571.21x = 1,522,040.66
  5. Step 5: Solve for x
    x = 1,522,040.66/1,571.21
  6. Step 6: Final answer
    x = 968.71

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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.