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Finding the Fourth Proportional to 397.29, 547.90 and 313.12

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Solution

The fourth proportional to 397.29, 547.90 and 313.12 is: 431.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.29 : 547.90 = 313.12 : x
  2. Step 2: Convert to fraction form
    397.29/547.90 = 313.12/x
  3. Step 3: Cross multiply
    397.29x = 547.90 × 313.12
  4. Step 4: Simplify right side
    397.29x = 171,554.14
  5. Step 5: Solve for x
    x = 171,554.14/397.29
  6. Step 6: Final answer
    x = 431.81

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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.