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Finding the Fourth Proportional to 279.15, 418.61 and 134.78

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Solution

The fourth proportional to 279.15, 418.61 and 134.78 is: 202.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.15 : 418.61 = 134.78 : x
  2. Step 2: Convert to fraction form
    279.15/418.61 = 134.78/x
  3. Step 3: Cross multiply
    279.15x = 418.61 × 134.78
  4. Step 4: Simplify right side
    279.15x = 56,417.49
  5. Step 5: Solve for x
    x = 56,417.49/279.15
  6. Step 6: Final answer
    x = 202.10

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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.