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Finding the Fourth Proportional to 831.49, 1,247.24 and 254.37

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Solution

The fourth proportional to 831.49, 1,247.24 and 254.37 is: 381.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.49 : 1,247.24 = 254.37 : x
  2. Step 2: Convert to fraction form
    831.49/1,247.24 = 254.37/x
  3. Step 3: Cross multiply
    831.49x = 1,247.24 × 254.37
  4. Step 4: Simplify right side
    831.49x = 317,260.44
  5. Step 5: Solve for x
    x = 317,260.44/831.49
  6. Step 6: Final answer
    x = 381.56

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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.