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Finding the Fourth Proportional to 526.50, 789.78 and 218.38

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Solution

The fourth proportional to 526.50, 789.78 and 218.38 is: 327.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.50 : 789.78 = 218.38 : x
  2. Step 2: Convert to fraction form
    526.50/789.78 = 218.38/x
  3. Step 3: Cross multiply
    526.50x = 789.78 × 218.38
  4. Step 4: Simplify right side
    526.50x = 172,472.16
  5. Step 5: Solve for x
    x = 172,472.16/526.50
  6. Step 6: Final answer
    x = 327.58

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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.