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Finding the Fourth Proportional to 525.78, 788.85 and 217.80

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Solution

The fourth proportional to 525.78, 788.85 and 217.80 is: 326.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.78 : 788.85 = 217.80 : x
  2. Step 2: Convert to fraction form
    525.78/788.85 = 217.80/x
  3. Step 3: Cross multiply
    525.78x = 788.85 × 217.80
  4. Step 4: Simplify right side
    525.78x = 171,811.53
  5. Step 5: Solve for x
    x = 171,811.53/525.78
  6. Step 6: Final answer
    x = 326.77

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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.