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Finding the Fourth Proportional to 1,380.52, 2,069.85 and 455.75

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Solution

The fourth proportional to 1,380.52, 2,069.85 and 455.75 is: 683.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.52 : 2,069.85 = 455.75 : x
  2. Step 2: Convert to fraction form
    1,380.52/2,069.85 = 455.75/x
  3. Step 3: Cross multiply
    1,380.52x = 2,069.85 × 455.75
  4. Step 4: Simplify right side
    1,380.52x = 943,334.14
  5. Step 5: Solve for x
    x = 943,334.14/1,380.52
  6. Step 6: Final answer
    x = 683.32

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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.