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Finding the Fourth Proportional to 654.79, 982.20 and 397.75

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Solution

The fourth proportional to 654.79, 982.20 and 397.75 is: 596.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.79 : 982.20 = 397.75 : x
  2. Step 2: Convert to fraction form
    654.79/982.20 = 397.75/x
  3. Step 3: Cross multiply
    654.79x = 982.20 × 397.75
  4. Step 4: Simplify right side
    654.79x = 390,670.05
  5. Step 5: Solve for x
    x = 390,670.05/654.79
  6. Step 6: Final answer
    x = 596.63

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.