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Finding the Fourth Proportional to 1,325.96, 1,989.34 and 839.35

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Solution

The fourth proportional to 1,325.96, 1,989.34 and 839.35 is: 1,259.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.96 : 1,989.34 = 839.35 : x
  2. Step 2: Convert to fraction form
    1,325.96/1,989.34 = 839.35/x
  3. Step 3: Cross multiply
    1,325.96x = 1,989.34 × 839.35
  4. Step 4: Simplify right side
    1,325.96x = 1,669,752.53
  5. Step 5: Solve for x
    x = 1,669,752.53/1,325.96
  6. Step 6: Final answer
    x = 1,259.28

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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.