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Finding the Fourth Proportional to 279.88, 419.78 and 94.78

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Solution

The fourth proportional to 279.88, 419.78 and 94.78 is: 142.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.88 : 419.78 = 94.78 : x
  2. Step 2: Convert to fraction form
    279.88/419.78 = 94.78/x
  3. Step 3: Cross multiply
    279.88x = 419.78 × 94.78
  4. Step 4: Simplify right side
    279.88x = 39,786.75
  5. Step 5: Solve for x
    x = 39,786.75/279.88
  6. Step 6: Final answer
    x = 142.16

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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.