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Finding the Fourth Proportional to 387.72, 531.93 and 378.12

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Solution

The fourth proportional to 387.72, 531.93 and 378.12 is: 518.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.72 : 531.93 = 378.12 : x
  2. Step 2: Convert to fraction form
    387.72/531.93 = 378.12/x
  3. Step 3: Cross multiply
    387.72x = 531.93 × 378.12
  4. Step 4: Simplify right side
    387.72x = 201,133.37
  5. Step 5: Solve for x
    x = 201,133.37/387.72
  6. Step 6: Final answer
    x = 518.76

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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.