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Finding the Fourth Proportional to 712.38, 983.06 and 397.63

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Solution

The fourth proportional to 712.38, 983.06 and 397.63 is: 548.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.38 : 983.06 = 397.63 : x
  2. Step 2: Convert to fraction form
    712.38/983.06 = 397.63/x
  3. Step 3: Cross multiply
    712.38x = 983.06 × 397.63
  4. Step 4: Simplify right side
    712.38x = 390,894.88
  5. Step 5: Solve for x
    x = 390,894.88/712.38
  6. Step 6: Final answer
    x = 548.71

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Half scale
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Double scale
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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.