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Finding the Fourth Proportional to 486.05, 671.43 and 387.68

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Solution

The fourth proportional to 486.05, 671.43 and 387.68 is: 535.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.05 : 671.43 = 387.68 : x
  2. Step 2: Convert to fraction form
    486.05/671.43 = 387.68/x
  3. Step 3: Cross multiply
    486.05x = 671.43 × 387.68
  4. Step 4: Simplify right side
    486.05x = 260,296.63
  5. Step 5: Solve for x
    x = 260,296.63/486.05
  6. Step 6: Final answer
    x = 535.54

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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.