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Finding the Fourth Proportional to 419.66, 579.11 and 253.79

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Solution

The fourth proportional to 419.66, 579.11 and 253.79 is: 350.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.66 : 579.11 = 253.79 : x
  2. Step 2: Convert to fraction form
    419.66/579.11 = 253.79/x
  3. Step 3: Cross multiply
    419.66x = 579.11 × 253.79
  4. Step 4: Simplify right side
    419.66x = 146,968.16
  5. Step 5: Solve for x
    x = 146,968.16/419.66
  6. Step 6: Final answer
    x = 350.21

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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.