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Finding the Fourth Proportional to 634.56, 875.67 and 354.78

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Solution

The fourth proportional to 634.56, 875.67 and 354.78 is: 489.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.56 : 875.67 = 354.78 : x
  2. Step 2: Convert to fraction form
    634.56/875.67 = 354.78/x
  3. Step 3: Cross multiply
    634.56x = 875.67 × 354.78
  4. Step 4: Simplify right side
    634.56x = 310,670.20
  5. Step 5: Solve for x
    x = 310,670.20/634.56
  6. Step 6: Final answer
    x = 489.58

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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.