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Finding the Fourth Proportional to 311.83, 430.44 and 279.02

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Solution

The fourth proportional to 311.83, 430.44 and 279.02 is: 385.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.83 : 430.44 = 279.02 : x
  2. Step 2: Convert to fraction form
    311.83/430.44 = 279.02/x
  3. Step 3: Cross multiply
    311.83x = 430.44 × 279.02
  4. Step 4: Simplify right side
    311.83x = 120,101.37
  5. Step 5: Solve for x
    x = 120,101.37/311.83
  6. Step 6: Final answer
    x = 385.15

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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.