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Finding the Fourth Proportional to 556.99, 768.80 and 391.25

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Solution

The fourth proportional to 556.99, 768.80 and 391.25 is: 540.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.99 : 768.80 = 391.25 : x
  2. Step 2: Convert to fraction form
    556.99/768.80 = 391.25/x
  3. Step 3: Cross multiply
    556.99x = 768.80 × 391.25
  4. Step 4: Simplify right side
    556.99x = 300,790.13
  5. Step 5: Solve for x
    x = 300,790.13/556.99
  6. Step 6: Final answer
    x = 540.03

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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.