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Finding the Fourth Proportional to 279.05, 418.57 and 86.67

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Solution

The fourth proportional to 279.05, 418.57 and 86.67 is: 130.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.05 : 418.57 = 86.67 : x
  2. Step 2: Convert to fraction form
    279.05/418.57 = 86.67/x
  3. Step 3: Cross multiply
    279.05x = 418.57 × 86.67
  4. Step 4: Simplify right side
    279.05x = 36,277.46
  5. Step 5: Solve for x
    x = 36,277.46/279.05
  6. Step 6: Final answer
    x = 130.00

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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.