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Finding the Fourth Proportional to 629.76, 939.60 and 581.28

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Solution

The fourth proportional to 629.76, 939.60 and 581.28 is: 867.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.76 : 939.60 = 581.28 : x
  2. Step 2: Convert to fraction form
    629.76/939.60 = 581.28/x
  3. Step 3: Cross multiply
    629.76x = 939.60 × 581.28
  4. Step 4: Simplify right side
    629.76x = 546,170.69
  5. Step 5: Solve for x
    x = 546,170.69/629.76
  6. Step 6: Final answer
    x = 867.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.