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Finding the Fourth Proportional to 397.02, 548.19 and 309.90

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Solution

The fourth proportional to 397.02, 548.19 and 309.90 is: 427.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.02 : 548.19 = 309.90 : x
  2. Step 2: Convert to fraction form
    397.02/548.19 = 309.90/x
  3. Step 3: Cross multiply
    397.02x = 548.19 × 309.90
  4. Step 4: Simplify right side
    397.02x = 169,884.08
  5. Step 5: Solve for x
    x = 169,884.08/397.02
  6. Step 6: Final answer
    x = 427.90

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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.