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Finding the Fourth Proportional to 313.32, 431.90 and 208.24

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Solution

The fourth proportional to 313.32, 431.90 and 208.24 is: 287.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.32 : 431.90 = 208.24 : x
  2. Step 2: Convert to fraction form
    313.32/431.90 = 208.24/x
  3. Step 3: Cross multiply
    313.32x = 431.90 × 208.24
  4. Step 4: Simplify right side
    313.32x = 89,938.86
  5. Step 5: Solve for x
    x = 89,938.86/313.32
  6. Step 6: Final answer
    x = 287.05

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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.