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Finding the Fourth Proportional to 279.09, 384.87 and 216.81

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Solution

The fourth proportional to 279.09, 384.87 and 216.81 is: 298.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.09 : 384.87 = 216.81 : x
  2. Step 2: Convert to fraction form
    279.09/384.87 = 216.81/x
  3. Step 3: Cross multiply
    279.09x = 384.87 × 216.81
  4. Step 4: Simplify right side
    279.09x = 83,443.66
  5. Step 5: Solve for x
    x = 83,443.66/279.09
  6. Step 6: Final answer
    x = 298.98

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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.