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Finding the Fourth Proportional to 1,423.62, 2,135.96 and 643.38

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Solution

The fourth proportional to 1,423.62, 2,135.96 and 643.38 is: 965.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.62 : 2,135.96 = 643.38 : x
  2. Step 2: Convert to fraction form
    1,423.62/2,135.96 = 643.38/x
  3. Step 3: Cross multiply
    1,423.62x = 2,135.96 × 643.38
  4. Step 4: Simplify right side
    1,423.62x = 1,374,230.73
  5. Step 5: Solve for x
    x = 1,374,230.73/1,423.62
  6. Step 6: Final answer
    x = 965.31

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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.