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Finding the Fourth Proportional to 831.20, 1,246.80 and 283.40

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Solution

The fourth proportional to 831.20, 1,246.80 and 283.40 is: 425.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.20 : 1,246.80 = 283.40 : x
  2. Step 2: Convert to fraction form
    831.20/1,246.80 = 283.40/x
  3. Step 3: Cross multiply
    831.20x = 1,246.80 × 283.40
  4. Step 4: Simplify right side
    831.20x = 353,343.12
  5. Step 5: Solve for x
    x = 353,343.12/831.20
  6. Step 6: Final answer
    x = 425.10

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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.