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Finding the Fourth Proportional to 397.58, 548.64 and 309.15

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Solution

The fourth proportional to 397.58, 548.64 and 309.15 is: 426.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.58 : 548.64 = 309.15 : x
  2. Step 2: Convert to fraction form
    397.58/548.64 = 309.15/x
  3. Step 3: Cross multiply
    397.58x = 548.64 × 309.15
  4. Step 4: Simplify right side
    397.58x = 169,612.06
  5. Step 5: Solve for x
    x = 169,612.06/397.58
  6. Step 6: Final answer
    x = 426.62

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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.