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Finding the Fourth Proportional to 419.55, 578.97 and 253.68

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Solution

The fourth proportional to 419.55, 578.97 and 253.68 is: 350.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.55 : 578.97 = 253.68 : x
  2. Step 2: Convert to fraction form
    419.55/578.97 = 253.68/x
  3. Step 3: Cross multiply
    419.55x = 578.97 × 253.68
  4. Step 4: Simplify right side
    419.55x = 146,873.11
  5. Step 5: Solve for x
    x = 146,873.11/419.55
  6. Step 6: Final answer
    x = 350.07

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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.