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Finding the Fourth Proportional to 309.08, 426.64 and 211.32

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Solution

The fourth proportional to 309.08, 426.64 and 211.32 is: 291.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.08 : 426.64 = 211.32 : x
  2. Step 2: Convert to fraction form
    309.08/426.64 = 211.32/x
  3. Step 3: Cross multiply
    309.08x = 426.64 × 211.32
  4. Step 4: Simplify right side
    309.08x = 90,157.56
  5. Step 5: Solve for x
    x = 90,157.56/309.08
  6. Step 6: Final answer
    x = 291.70

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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.