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Finding the Fourth Proportional to 521.75, 785.72 and 454.09

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Solution

The fourth proportional to 521.75, 785.72 and 454.09 is: 683.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.75 : 785.72 = 454.09 : x
  2. Step 2: Convert to fraction form
    521.75/785.72 = 454.09/x
  3. Step 3: Cross multiply
    521.75x = 785.72 × 454.09
  4. Step 4: Simplify right side
    521.75x = 356,787.59
  5. Step 5: Solve for x
    x = 356,787.59/521.75
  6. Step 6: Final answer
    x = 683.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.