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Finding the Fourth Proportional to 279.15, 418.56 and 125.05

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Solution

The fourth proportional to 279.15, 418.56 and 125.05 is: 187.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.15 : 418.56 = 125.05 : x
  2. Step 2: Convert to fraction form
    279.15/418.56 = 125.05/x
  3. Step 3: Cross multiply
    279.15x = 418.56 × 125.05
  4. Step 4: Simplify right side
    279.15x = 52,339.41
  5. Step 5: Solve for x
    x = 52,339.41/279.15
  6. Step 6: Final answer
    x = 187.50

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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.