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Finding the Fourth Proportional to 419.80, 579.40 and 245.14

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Solution

The fourth proportional to 419.80, 579.40 and 245.14 is: 338.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.80 : 579.40 = 245.14 : x
  2. Step 2: Convert to fraction form
    419.80/579.40 = 245.14/x
  3. Step 3: Cross multiply
    419.80x = 579.40 × 245.14
  4. Step 4: Simplify right side
    419.80x = 142,034.12
  5. Step 5: Solve for x
    x = 142,034.12/419.80
  6. Step 6: Final answer
    x = 338.34

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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.