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Finding the Fourth Proportional to 1,327.79, 1,989.60 and 839.81

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Solution

The fourth proportional to 1,327.79, 1,989.60 and 839.81 is: 1,258.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.79 : 1,989.60 = 839.81 : x
  2. Step 2: Convert to fraction form
    1,327.79/1,989.60 = 839.81/x
  3. Step 3: Cross multiply
    1,327.79x = 1,989.60 × 839.81
  4. Step 4: Simplify right side
    1,327.79x = 1,670,894.89
  5. Step 5: Solve for x
    x = 1,670,894.89/1,327.79
  6. Step 6: Final answer
    x = 1,258.41

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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.