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Finding the Fourth Proportional to 1,332.75, 1,999.85 and 648.75

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Solution

The fourth proportional to 1,332.75, 1,999.85 and 648.75 is: 973.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.75 : 1,999.85 = 648.75 : x
  2. Step 2: Convert to fraction form
    1,332.75/1,999.85 = 648.75/x
  3. Step 3: Cross multiply
    1,332.75x = 1,999.85 × 648.75
  4. Step 4: Simplify right side
    1,332.75x = 1,297,399.44
  5. Step 5: Solve for x
    x = 1,297,399.44/1,332.75
  6. Step 6: Final answer
    x = 973.48

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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.