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Finding the Fourth Proportional to 311.01, 432.17 and 307.63

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Solution

The fourth proportional to 311.01, 432.17 and 307.63 is: 427.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.01 : 432.17 = 307.63 : x
  2. Step 2: Convert to fraction form
    311.01/432.17 = 307.63/x
  3. Step 3: Cross multiply
    311.01x = 432.17 × 307.63
  4. Step 4: Simplify right side
    311.01x = 132,946.92
  5. Step 5: Solve for x
    x = 132,946.92/311.01
  6. Step 6: Final answer
    x = 427.48

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.