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Finding the Fourth Proportional to 419.64, 579 and 272.28

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Solution

The fourth proportional to 419.64, 579 and 272.28 is: 375.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.64 : 579 = 272.28 : x
  2. Step 2: Convert to fraction form
    419.64/579 = 272.28/x
  3. Step 3: Cross multiply
    419.64x = 579 × 272.28
  4. Step 4: Simplify right side
    419.64x = 157,650.12
  5. Step 5: Solve for x
    x = 157,650.12/419.64
  6. Step 6: Final answer
    x = 375.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.