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Finding the Fourth Proportional to 712.72, 983.10 and 628.48

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Solution

The fourth proportional to 712.72, 983.10 and 628.48 is: 866.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.72 : 983.10 = 628.48 : x
  2. Step 2: Convert to fraction form
    712.72/983.10 = 628.48/x
  3. Step 3: Cross multiply
    712.72x = 983.10 × 628.48
  4. Step 4: Simplify right side
    712.72x = 617,858.69
  5. Step 5: Solve for x
    x = 617,858.69/712.72
  6. Step 6: Final answer
    x = 866.90

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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.