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Finding the Fourth Proportional to 1,965.18, 2,948.94 and 991.38

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Solution

The fourth proportional to 1,965.18, 2,948.94 and 991.38 is: 1,487.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,965.18 : 2,948.94 = 991.38 : x
  2. Step 2: Convert to fraction form
    1,965.18/2,948.94 = 991.38/x
  3. Step 3: Cross multiply
    1,965.18x = 2,948.94 × 991.38
  4. Step 4: Simplify right side
    1,965.18x = 2,923,520.14
  5. Step 5: Solve for x
    x = 2,923,520.14/1,965.18
  6. Step 6: Final answer
    x = 1,487.66

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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.