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Finding the Fourth Proportional to 712.64, 1,072.72 and 650.36

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Solution

The fourth proportional to 712.64, 1,072.72 and 650.36 is: 978.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.64 : 1,072.72 = 650.36 : x
  2. Step 2: Convert to fraction form
    712.64/1,072.72 = 650.36/x
  3. Step 3: Cross multiply
    712.64x = 1,072.72 × 650.36
  4. Step 4: Simplify right side
    712.64x = 697,654.18
  5. Step 5: Solve for x
    x = 697,654.18/712.64
  6. Step 6: Final answer
    x = 978.97

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.