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Finding the Fourth Proportional to 882.40, 1,323.60 and 831.10

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Solution

The fourth proportional to 882.40, 1,323.60 and 831.10 is: 1,246.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.40 : 1,323.60 = 831.10 : x
  2. Step 2: Convert to fraction form
    882.40/1,323.60 = 831.10/x
  3. Step 3: Cross multiply
    882.40x = 1,323.60 × 831.10
  4. Step 4: Simplify right side
    882.40x = 1,100,043.96
  5. Step 5: Solve for x
    x = 1,100,043.96/882.40
  6. Step 6: Final answer
    x = 1,246.65

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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.