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Finding the Fourth Proportional to 620.28, 929.70 and 548.28

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Solution

The fourth proportional to 620.28, 929.70 and 548.28 is: 821.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.28 : 929.70 = 548.28 : x
  2. Step 2: Convert to fraction form
    620.28/929.70 = 548.28/x
  3. Step 3: Cross multiply
    620.28x = 929.70 × 548.28
  4. Step 4: Simplify right side
    620.28x = 509,735.92
  5. Step 5: Solve for x
    x = 509,735.92/620.28
  6. Step 6: Final answer
    x = 821.78

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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.