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Finding the Fourth Proportional to 634.79, 875.95 and 355.03

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Solution

The fourth proportional to 634.79, 875.95 and 355.03 is: 489.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.79 : 875.95 = 355.03 : x
  2. Step 2: Convert to fraction form
    634.79/875.95 = 355.03/x
  3. Step 3: Cross multiply
    634.79x = 875.95 × 355.03
  4. Step 4: Simplify right side
    634.79x = 310,986.78
  5. Step 5: Solve for x
    x = 310,986.78/634.79
  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.