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Finding the Fourth Proportional to 637.12, 878.64 and 489.76

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Solution

The fourth proportional to 637.12, 878.64 and 489.76 is: 675.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.12 : 878.64 = 489.76 : x
  2. Step 2: Convert to fraction form
    637.12/878.64 = 489.76/x
  3. Step 3: Cross multiply
    637.12x = 878.64 × 489.76
  4. Step 4: Simplify right side
    637.12x = 430,322.73
  5. Step 5: Solve for x
    x = 430,322.73/637.12
  6. Step 6: Final answer
    x = 675.42

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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.