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Finding the Fourth Proportional to 1,328.60, 1,991.82 and 495.40

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Solution

The fourth proportional to 1,328.60, 1,991.82 and 495.40 is: 742.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.60 : 1,991.82 = 495.40 : x
  2. Step 2: Convert to fraction form
    1,328.60/1,991.82 = 495.40/x
  3. Step 3: Cross multiply
    1,328.60x = 1,991.82 × 495.40
  4. Step 4: Simplify right side
    1,328.60x = 986,747.63
  5. Step 5: Solve for x
    x = 986,747.63/1,328.60
  6. Step 6: Final answer
    x = 742.70

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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.