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Finding the Fourth Proportional to 712.91, 983.81 and 398.18

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Solution

The fourth proportional to 712.91, 983.81 and 398.18 is: 549.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.91 : 983.81 = 398.18 : x
  2. Step 2: Convert to fraction form
    712.91/983.81 = 398.18/x
  3. Step 3: Cross multiply
    712.91x = 983.81 × 398.18
  4. Step 4: Simplify right side
    712.91x = 391,731.91
  5. Step 5: Solve for x
    x = 391,731.91/712.91
  6. Step 6: Final answer
    x = 549.48

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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.