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Finding the Fourth Proportional to 548.37, 756.58 and 390.87

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Solution

The fourth proportional to 548.37, 756.58 and 390.87 is: 539.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.37 : 756.58 = 390.87 : x
  2. Step 2: Convert to fraction form
    548.37/756.58 = 390.87/x
  3. Step 3: Cross multiply
    548.37x = 756.58 × 390.87
  4. Step 4: Simplify right side
    548.37x = 295,723.45
  5. Step 5: Solve for x
    x = 295,723.45/548.37
  6. Step 6: Final answer
    x = 539.28

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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.