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Finding the Fourth Proportional to 712.97, 983.94 and 398.26

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Solution

The fourth proportional to 712.97, 983.94 and 398.26 is: 549.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.97 : 983.94 = 398.26 : x
  2. Step 2: Convert to fraction form
    712.97/983.94 = 398.26/x
  3. Step 3: Cross multiply
    712.97x = 983.94 × 398.26
  4. Step 4: Simplify right side
    712.97x = 391,857.03
  5. Step 5: Solve for x
    x = 391,857.03/712.97
  6. Step 6: Final answer
    x = 549.62

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1.5x scale

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.