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Finding the Fourth Proportional to 527.68, 789.72 and 440.20

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Solution

The fourth proportional to 527.68, 789.72 and 440.20 is: 658.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.68 : 789.72 = 440.20 : x
  2. Step 2: Convert to fraction form
    527.68/789.72 = 440.20/x
  3. Step 3: Cross multiply
    527.68x = 789.72 × 440.20
  4. Step 4: Simplify right side
    527.68x = 347,634.74
  5. Step 5: Solve for x
    x = 347,634.74/527.68
  6. Step 6: Final answer
    x = 658.80

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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.