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Finding the Fourth Proportional to 547.48, 755.78 and 390.44

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Solution

The fourth proportional to 547.48, 755.78 and 390.44 is: 538.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.48 : 755.78 = 390.44 : x
  2. Step 2: Convert to fraction form
    547.48/755.78 = 390.44/x
  3. Step 3: Cross multiply
    547.48x = 755.78 × 390.44
  4. Step 4: Simplify right side
    547.48x = 295,081.01
  5. Step 5: Solve for x
    x = 295,081.01/547.48
  6. Step 6: Final answer
    x = 538.98

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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.