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Finding the Fourth Proportional to 999.89, 1,378.50 and 831.19

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Solution

The fourth proportional to 999.89, 1,378.50 and 831.19 is: 1,145.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.89 : 1,378.50 = 831.19 : x
  2. Step 2: Convert to fraction form
    999.89/1,378.50 = 831.19/x
  3. Step 3: Cross multiply
    999.89x = 1,378.50 × 831.19
  4. Step 4: Simplify right side
    999.89x = 1,145,796.11
  5. Step 5: Solve for x
    x = 1,145,796.11/999.89
  6. Step 6: Final answer
    x = 1,145.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.