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Finding the Fourth Proportional to 419.40, 578.72 and 253.56

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Solution

The fourth proportional to 419.40, 578.72 and 253.56 is: 349.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.40 : 578.72 = 253.56 : x
  2. Step 2: Convert to fraction form
    419.40/578.72 = 253.56/x
  3. Step 3: Cross multiply
    419.40x = 578.72 × 253.56
  4. Step 4: Simplify right side
    419.40x = 146,740.24
  5. Step 5: Solve for x
    x = 146,740.24/419.40
  6. Step 6: Final answer
    x = 349.88

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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.