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Finding the Fourth Proportional to 419.11, 578.08 and 279.16

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Solution

The fourth proportional to 419.11, 578.08 and 279.16 is: 385.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.11 : 578.08 = 279.16 : x
  2. Step 2: Convert to fraction form
    419.11/578.08 = 279.16/x
  3. Step 3: Cross multiply
    419.11x = 578.08 × 279.16
  4. Step 4: Simplify right side
    419.11x = 161,376.11
  5. Step 5: Solve for x
    x = 161,376.11/419.11
  6. Step 6: Final answer
    x = 385.04

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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.