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Finding the Fourth Proportional to 1,404.87, 2,107.70 and 431.11

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Solution

The fourth proportional to 1,404.87, 2,107.70 and 431.11 is: 646.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,404.87 : 2,107.70 = 431.11 : x
  2. Step 2: Convert to fraction form
    1,404.87/2,107.70 = 431.11/x
  3. Step 3: Cross multiply
    1,404.87x = 2,107.70 × 431.11
  4. Step 4: Simplify right side
    1,404.87x = 908,650.55
  5. Step 5: Solve for x
    x = 908,650.55/1,404.87
  6. Step 6: Final answer
    x = 646.79

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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.