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Finding the Fourth Proportional to 712.11, 982.71 and 397.38

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Solution

The fourth proportional to 712.11, 982.71 and 397.38 is: 548.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.11 : 982.71 = 397.38 : x
  2. Step 2: Convert to fraction form
    712.11/982.71 = 397.38/x
  3. Step 3: Cross multiply
    712.11x = 982.71 × 397.38
  4. Step 4: Simplify right side
    712.11x = 390,509.30
  5. Step 5: Solve for x
    x = 390,509.30/712.11
  6. Step 6: Final answer
    x = 548.38

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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.