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Finding the Fourth Proportional to 1,429.64, 1,982.15 and 1,381.64

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Solution

The fourth proportional to 1,429.64, 1,982.15 and 1,381.64 is: 1,915.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.64 : 1,982.15 = 1,381.64 : x
  2. Step 2: Convert to fraction form
    1,429.64/1,982.15 = 1,381.64/x
  3. Step 3: Cross multiply
    1,429.64x = 1,982.15 × 1,381.64
  4. Step 4: Simplify right side
    1,429.64x = 2,738,617.73
  5. Step 5: Solve for x
    x = 2,738,617.73/1,429.64
  6. Step 6: Final answer
    x = 1,915.60

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.