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Finding the Fourth Proportional to 419.85, 579.47 and 245.28

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Solution

The fourth proportional to 419.85, 579.47 and 245.28 is: 338.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.85 : 579.47 = 245.28 : x
  2. Step 2: Convert to fraction form
    419.85/579.47 = 245.28/x
  3. Step 3: Cross multiply
    419.85x = 579.47 × 245.28
  4. Step 4: Simplify right side
    419.85x = 142,131.18
  5. Step 5: Solve for x
    x = 142,131.18/419.85
  6. Step 6: Final answer
    x = 338.53

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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.