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Finding the Fourth Proportional to 279.18, 418.51 and 256.11

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Solution

The fourth proportional to 279.18, 418.51 and 256.11 is: 383.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.18 : 418.51 = 256.11 : x
  2. Step 2: Convert to fraction form
    279.18/418.51 = 256.11/x
  3. Step 3: Cross multiply
    279.18x = 418.51 × 256.11
  4. Step 4: Simplify right side
    279.18x = 107,185.70
  5. Step 5: Solve for x
    x = 107,185.70/279.18
  6. Step 6: Final answer
    x = 383.93

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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.