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Finding the Fourth Proportional to 378.72, 518.88 and 373.92

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Solution

The fourth proportional to 378.72, 518.88 and 373.92 is: 512.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.72 : 518.88 = 373.92 : x
  2. Step 2: Convert to fraction form
    378.72/518.88 = 373.92/x
  3. Step 3: Cross multiply
    378.72x = 518.88 × 373.92
  4. Step 4: Simplify right side
    378.72x = 194,019.61
  5. Step 5: Solve for x
    x = 194,019.61/378.72
  6. Step 6: Final answer
    x = 512.30

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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.