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Finding the Fourth Proportional to 500.45, 749.61 and 427.64

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Solution

The fourth proportional to 500.45, 749.61 and 427.64 is: 640.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.45 : 749.61 = 427.64 : x
  2. Step 2: Convert to fraction form
    500.45/749.61 = 427.64/x
  3. Step 3: Cross multiply
    500.45x = 749.61 × 427.64
  4. Step 4: Simplify right side
    500.45x = 320,559.47
  5. Step 5: Solve for x
    x = 320,559.47/500.45
  6. Step 6: Final answer
    x = 640.55

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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.