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Finding the Fourth Proportional to 920.26, 1,380.84 and 677.87

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Solution

The fourth proportional to 920.26, 1,380.84 and 677.87 is: 1,017.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.26 : 1,380.84 = 677.87 : x
  2. Step 2: Convert to fraction form
    920.26/1,380.84 = 677.87/x
  3. Step 3: Cross multiply
    920.26x = 1,380.84 × 677.87
  4. Step 4: Simplify right side
    920.26x = 936,030.01
  5. Step 5: Solve for x
    x = 936,030.01/920.26
  6. Step 6: Final answer
    x = 1,017.14

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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.