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Finding the Fourth Proportional to 1,391.09, 1,919.70 and 831.53

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Solution

The fourth proportional to 1,391.09, 1,919.70 and 831.53 is: 1,147.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.09 : 1,919.70 = 831.53 : x
  2. Step 2: Convert to fraction form
    1,391.09/1,919.70 = 831.53/x
  3. Step 3: Cross multiply
    1,391.09x = 1,919.70 × 831.53
  4. Step 4: Simplify right side
    1,391.09x = 1,596,298.46
  5. Step 5: Solve for x
    x = 1,596,298.46/1,391.09
  6. Step 6: Final answer
    x = 1,147.51

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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.