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Finding the Fourth Proportional to 525.78, 789.06 and 217.66

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Solution

The fourth proportional to 525.78, 789.06 and 217.66 is: 326.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.78 : 789.06 = 217.66 : x
  2. Step 2: Convert to fraction form
    525.78/789.06 = 217.66/x
  3. Step 3: Cross multiply
    525.78x = 789.06 × 217.66
  4. Step 4: Simplify right side
    525.78x = 171,746.80
  5. Step 5: Solve for x
    x = 171,746.80/525.78
  6. Step 6: Final answer
    x = 326.65

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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.