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Finding the Fourth Proportional to 311.98, 430.54 and 187.69

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Solution

The fourth proportional to 311.98, 430.54 and 187.69 is: 259.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.98 : 430.54 = 187.69 : x
  2. Step 2: Convert to fraction form
    311.98/430.54 = 187.69/x
  3. Step 3: Cross multiply
    311.98x = 430.54 × 187.69
  4. Step 4: Simplify right side
    311.98x = 80,808.05
  5. Step 5: Solve for x
    x = 80,808.05/311.98
  6. Step 6: Final answer
    x = 259.02

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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.