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Finding the Fourth Proportional to 831.54, 1,240.16 and 804.20

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Solution

The fourth proportional to 831.54, 1,240.16 and 804.20 is: 1,199.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.54 : 1,240.16 = 804.20 : x
  2. Step 2: Convert to fraction form
    831.54/1,240.16 = 804.20/x
  3. Step 3: Cross multiply
    831.54x = 1,240.16 × 804.20
  4. Step 4: Simplify right side
    831.54x = 997,336.67
  5. Step 5: Solve for x
    x = 997,336.67/831.54
  6. Step 6: Final answer
    x = 1,199.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.