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Finding the Fourth Proportional to 486.77, 728.78 and 371.68

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Solution

The fourth proportional to 486.77, 728.78 and 371.68 is: 556.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.77 : 728.78 = 371.68 : x
  2. Step 2: Convert to fraction form
    486.77/728.78 = 371.68/x
  3. Step 3: Cross multiply
    486.77x = 728.78 × 371.68
  4. Step 4: Simplify right side
    486.77x = 270,869.27
  5. Step 5: Solve for x
    x = 270,869.27/486.77
  6. Step 6: Final answer
    x = 556.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.