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Finding the Fourth Proportional to 279.41, 419.32 and 142.56

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Solution

The fourth proportional to 279.41, 419.32 and 142.56 is: 213.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.41 : 419.32 = 142.56 : x
  2. Step 2: Convert to fraction form
    279.41/419.32 = 142.56/x
  3. Step 3: Cross multiply
    279.41x = 419.32 × 142.56
  4. Step 4: Simplify right side
    279.41x = 59,779.48
  5. Step 5: Solve for x
    x = 59,779.48/279.41
  6. Step 6: Final answer
    x = 213.95

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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.