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Finding the Fourth Proportional to 1,179.74, 1,629.51 and 831.98

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Solution

The fourth proportional to 1,179.74, 1,629.51 and 831.98 is: 1,149.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.74 : 1,629.51 = 831.98 : x
  2. Step 2: Convert to fraction form
    1,179.74/1,629.51 = 831.98/x
  3. Step 3: Cross multiply
    1,179.74x = 1,629.51 × 831.98
  4. Step 4: Simplify right side
    1,179.74x = 1,355,719.73
  5. Step 5: Solve for x
    x = 1,355,719.73/1,179.74
  6. Step 6: Final answer
    x = 1,149.17

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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.