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Finding the Fourth Proportional to 397.83, 548.26 and 390.74

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Solution

The fourth proportional to 397.83, 548.26 and 390.74 is: 538.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.83 : 548.26 = 390.74 : x
  2. Step 2: Convert to fraction form
    397.83/548.26 = 390.74/x
  3. Step 3: Cross multiply
    397.83x = 548.26 × 390.74
  4. Step 4: Simplify right side
    397.83x = 214,227.51
  5. Step 5: Solve for x
    x = 214,227.51/397.83
  6. Step 6: Final answer
    x = 538.49

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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.