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Finding the Fourth Proportional to 547.28, 755.52 and 399.86

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Solution

The fourth proportional to 547.28, 755.52 and 399.86 is: 552.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.28 : 755.52 = 399.86 : x
  2. Step 2: Convert to fraction form
    547.28/755.52 = 399.86/x
  3. Step 3: Cross multiply
    547.28x = 755.52 × 399.86
  4. Step 4: Simplify right side
    547.28x = 302,102.23
  5. Step 5: Solve for x
    x = 302,102.23/547.28
  6. Step 6: Final answer
    x = 552.01

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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.