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Finding the Fourth Proportional to 994.77, 1,490.92 and 831.96

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Solution

The fourth proportional to 994.77, 1,490.92 and 831.96 is: 1,246.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.77 : 1,490.92 = 831.96 : x
  2. Step 2: Convert to fraction form
    994.77/1,490.92 = 831.96/x
  3. Step 3: Cross multiply
    994.77x = 1,490.92 × 831.96
  4. Step 4: Simplify right side
    994.77x = 1,240,385.80
  5. Step 5: Solve for x
    x = 1,240,385.80/994.77
  6. Step 6: Final answer
    x = 1,246.91

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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.