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Finding the Fourth Proportional to 984.52, 1,358.57 and 643.27

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Solution

The fourth proportional to 984.52, 1,358.57 and 643.27 is: 887.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.52 : 1,358.57 = 643.27 : x
  2. Step 2: Convert to fraction form
    984.52/1,358.57 = 643.27/x
  3. Step 3: Cross multiply
    984.52x = 1,358.57 × 643.27
  4. Step 4: Simplify right side
    984.52x = 873,917.31
  5. Step 5: Solve for x
    x = 873,917.31/984.52
  6. Step 6: Final answer
    x = 887.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.