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Finding the Fourth Proportional to 712.32, 982.98 and 397.57

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Solution

The fourth proportional to 712.32, 982.98 and 397.57 is: 548.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.32 : 982.98 = 397.57 : x
  2. Step 2: Convert to fraction form
    712.32/982.98 = 397.57/x
  3. Step 3: Cross multiply
    712.32x = 982.98 × 397.57
  4. Step 4: Simplify right side
    712.32x = 390,798.44
  5. Step 5: Solve for x
    x = 390,798.44/712.32
  6. Step 6: Final answer
    x = 548.63

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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.