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Finding the Fourth Proportional to 638.01, 957.20 and 205.18

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Solution

The fourth proportional to 638.01, 957.20 and 205.18 is: 307.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.01 : 957.20 = 205.18 : x
  2. Step 2: Convert to fraction form
    638.01/957.20 = 205.18/x
  3. Step 3: Cross multiply
    638.01x = 957.20 × 205.18
  4. Step 4: Simplify right side
    638.01x = 196,394.88
  5. Step 5: Solve for x
    x = 196,394.88/638.01
  6. Step 6: Final answer
    x = 307.82

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Half scale
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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.