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Finding the Fourth Proportional to 1,328.53, 1,990.97 and 677.90

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Solution

The fourth proportional to 1,328.53, 1,990.97 and 677.90 is: 1,015.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.53 : 1,990.97 = 677.90 : x
  2. Step 2: Convert to fraction form
    1,328.53/1,990.97 = 677.90/x
  3. Step 3: Cross multiply
    1,328.53x = 1,990.97 × 677.90
  4. Step 4: Simplify right side
    1,328.53x = 1,349,678.56
  5. Step 5: Solve for x
    x = 1,349,678.56/1,328.53
  6. Step 6: Final answer
    x = 1,015.92

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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.