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Finding the Fourth Proportional to 419.28, 577.80 and 279.24

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Solution

The fourth proportional to 419.28, 577.80 and 279.24 is: 384.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.28 : 577.80 = 279.24 : x
  2. Step 2: Convert to fraction form
    419.28/577.80 = 279.24/x
  3. Step 3: Cross multiply
    419.28x = 577.80 × 279.24
  4. Step 4: Simplify right side
    419.28x = 161,344.87
  5. Step 5: Solve for x
    x = 161,344.87/419.28
  6. Step 6: Final answer
    x = 384.81

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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.