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Finding the Fourth Proportional to 651.56, 976.80 and 326.76

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Solution

The fourth proportional to 651.56, 976.80 and 326.76 is: 489.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.56 : 976.80 = 326.76 : x
  2. Step 2: Convert to fraction form
    651.56/976.80 = 326.76/x
  3. Step 3: Cross multiply
    651.56x = 976.80 × 326.76
  4. Step 4: Simplify right side
    651.56x = 319,179.17
  5. Step 5: Solve for x
    x = 319,179.17/651.56
  6. Step 6: Final answer
    x = 489.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.