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Finding the Fourth Proportional to 311.03, 426.15 and 307.19

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Solution

The fourth proportional to 311.03, 426.15 and 307.19 is: 420.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.03 : 426.15 = 307.19 : x
  2. Step 2: Convert to fraction form
    311.03/426.15 = 307.19/x
  3. Step 3: Cross multiply
    311.03x = 426.15 × 307.19
  4. Step 4: Simplify right side
    311.03x = 130,909.64
  5. Step 5: Solve for x
    x = 130,909.64/311.03
  6. Step 6: Final answer
    x = 420.89

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.