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Finding the Fourth Proportional to 831.85, 1,247.35 and 276.36

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Solution

The fourth proportional to 831.85, 1,247.35 and 276.36 is: 414.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.85 : 1,247.35 = 276.36 : x
  2. Step 2: Convert to fraction form
    831.85/1,247.35 = 276.36/x
  3. Step 3: Cross multiply
    831.85x = 1,247.35 × 276.36
  4. Step 4: Simplify right side
    831.85x = 344,718.34
  5. Step 5: Solve for x
    x = 344,718.34/831.85
  6. Step 6: Final answer
    x = 414.40

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Double scale
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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.