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Finding the Fourth Proportional to 1,404.70, 2,107.05 and 1,285.90

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Solution

The fourth proportional to 1,404.70, 2,107.05 and 1,285.90 is: 1,928.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,404.70 : 2,107.05 = 1,285.90 : x
  2. Step 2: Convert to fraction form
    1,404.70/2,107.05 = 1,285.90/x
  3. Step 3: Cross multiply
    1,404.70x = 2,107.05 × 1,285.90
  4. Step 4: Simplify right side
    1,404.70x = 2,709,455.60
  5. Step 5: Solve for x
    x = 2,709,455.60/1,404.70
  6. Step 6: Final answer
    x = 1,928.85

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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.