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Finding the Fourth Proportional to 279, 418.57 and 86.63

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Solution

The fourth proportional to 279, 418.57 and 86.63 is: 129.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    279 : 418.57 = 86.63 : x
  2. Step 2: Convert to fraction form
    279/418.57 = 86.63/x
  3. Step 3: Cross multiply
    279x = 418.57 × 86.63
  4. Step 4: Simplify right side
    279x = 36,258.41
  5. Step 5: Solve for x
    x = 36,258.41/279
  6. Step 6: Final answer
    x = 129.96

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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.