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Finding the Fourth Proportional to 634.90, 875.96 and 355.09

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Solution

The fourth proportional to 634.90, 875.96 and 355.09 is: 489.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.90 : 875.96 = 355.09 : x
  2. Step 2: Convert to fraction form
    634.90/875.96 = 355.09/x
  3. Step 3: Cross multiply
    634.90x = 875.96 × 355.09
  4. Step 4: Simplify right side
    634.90x = 311,044.64
  5. Step 5: Solve for x
    x = 311,044.64/634.90
  6. Step 6: Final answer
    x = 489.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.