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Finding the Fourth Proportional to 831.20, 1,246.68 and 344.36

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Solution

The fourth proportional to 831.20, 1,246.68 and 344.36 is: 516.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.20 : 1,246.68 = 344.36 : x
  2. Step 2: Convert to fraction form
    831.20/1,246.68 = 344.36/x
  3. Step 3: Cross multiply
    831.20x = 1,246.68 × 344.36
  4. Step 4: Simplify right side
    831.20x = 429,306.72
  5. Step 5: Solve for x
    x = 429,306.72/831.20
  6. Step 6: Final answer
    x = 516.49

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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.