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Finding the Fourth Proportional to 399.93, 548.12 and 387.57

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Solution

The fourth proportional to 399.93, 548.12 and 387.57 is: 531.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.93 : 548.12 = 387.57 : x
  2. Step 2: Convert to fraction form
    399.93/548.12 = 387.57/x
  3. Step 3: Cross multiply
    399.93x = 548.12 × 387.57
  4. Step 4: Simplify right side
    399.93x = 212,434.87
  5. Step 5: Solve for x
    x = 212,434.87/399.93
  6. Step 6: Final answer
    x = 531.18

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.