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Finding the Fourth Proportional to 278.72, 419.16 and 253.88

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Solution

The fourth proportional to 278.72, 419.16 and 253.88 is: 381.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.72 : 419.16 = 253.88 : x
  2. Step 2: Convert to fraction form
    278.72/419.16 = 253.88/x
  3. Step 3: Cross multiply
    278.72x = 419.16 × 253.88
  4. Step 4: Simplify right side
    278.72x = 106,416.34
  5. Step 5: Solve for x
    x = 106,416.34/278.72
  6. Step 6: Final answer
    x = 381.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.