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Finding the Fourth Proportional to 712.10, 982.72 and 397.38

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Solution

The fourth proportional to 712.10, 982.72 and 397.38 is: 548.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.10 : 982.72 = 397.38 : x
  2. Step 2: Convert to fraction form
    712.10/982.72 = 397.38/x
  3. Step 3: Cross multiply
    712.10x = 982.72 × 397.38
  4. Step 4: Simplify right side
    712.10x = 390,513.27
  5. Step 5: Solve for x
    x = 390,513.27/712.10
  6. Step 6: Final answer
    x = 548.40

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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.