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Finding the Fourth Proportional to 279.12, 384.80 and 211.68

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Solution

The fourth proportional to 279.12, 384.80 and 211.68 is: 291.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.12 : 384.80 = 211.68 : x
  2. Step 2: Convert to fraction form
    279.12/384.80 = 211.68/x
  3. Step 3: Cross multiply
    279.12x = 384.80 × 211.68
  4. Step 4: Simplify right side
    279.12x = 81,454.46
  5. Step 5: Solve for x
    x = 81,454.46/279.12
  6. Step 6: Final answer
    x = 291.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.