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Finding the Fourth Proportional to 712.89, 983.21 and 709.25

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Solution

The fourth proportional to 712.89, 983.21 and 709.25 is: 978.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.89 : 983.21 = 709.25 : x
  2. Step 2: Convert to fraction form
    712.89/983.21 = 709.25/x
  3. Step 3: Cross multiply
    712.89x = 983.21 × 709.25
  4. Step 4: Simplify right side
    712.89x = 697,333.23
  5. Step 5: Solve for x
    x = 697,333.23/712.89
  6. Step 6: Final answer
    x = 978.18

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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.