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Finding the Fourth Proportional to 626.27, 939.20 and 209.71

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Solution

The fourth proportional to 626.27, 939.20 and 209.71 is: 314.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.27 : 939.20 = 209.71 : x
  2. Step 2: Convert to fraction form
    626.27/939.20 = 209.71/x
  3. Step 3: Cross multiply
    626.27x = 939.20 × 209.71
  4. Step 4: Simplify right side
    626.27x = 196,960.94
  5. Step 5: Solve for x
    x = 196,960.94/626.27
  6. Step 6: Final answer
    x = 314.50

Related Problems

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Half scale
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Double scale
Find fourth proportional to 627.27, 940.70 and 210.71
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.