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Finding the Fourth Proportional to 936.31, 1,404.12 and 311.49

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Solution

The fourth proportional to 936.31, 1,404.12 and 311.49 is: 467.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.31 : 1,404.12 = 311.49 : x
  2. Step 2: Convert to fraction form
    936.31/1,404.12 = 311.49/x
  3. Step 3: Cross multiply
    936.31x = 1,404.12 × 311.49
  4. Step 4: Simplify right side
    936.31x = 437,369.34
  5. Step 5: Solve for x
    x = 437,369.34/936.31
  6. Step 6: Final answer
    x = 467.12

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.