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Finding the Fourth Proportional to 419.24, 578.46 and 279.20

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Solution

The fourth proportional to 419.24, 578.46 and 279.20 is: 385.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.24 : 578.46 = 279.20 : x
  2. Step 2: Convert to fraction form
    419.24/578.46 = 279.20/x
  3. Step 3: Cross multiply
    419.24x = 578.46 × 279.20
  4. Step 4: Simplify right side
    419.24x = 161,506.03
  5. Step 5: Solve for x
    x = 161,506.03/419.24
  6. Step 6: Final answer
    x = 385.24

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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.