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Finding the Fourth Proportional to 1,709.21, 2,563.82 and 613.89

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Solution

The fourth proportional to 1,709.21, 2,563.82 and 613.89 is: 920.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,709.21 : 2,563.82 = 613.89 : x
  2. Step 2: Convert to fraction form
    1,709.21/2,563.82 = 613.89/x
  3. Step 3: Cross multiply
    1,709.21x = 2,563.82 × 613.89
  4. Step 4: Simplify right side
    1,709.21x = 1,573,900.39
  5. Step 5: Solve for x
    x = 1,573,900.39/1,709.21
  6. Step 6: Final answer
    x = 920.84

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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.