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Finding the Fourth Proportional to 639, 955.74 and 378.38

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Solution

The fourth proportional to 639, 955.74 and 378.38 is: 565.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    639 : 955.74 = 378.38 : x
  2. Step 2: Convert to fraction form
    639/955.74 = 378.38/x
  3. Step 3: Cross multiply
    639x = 955.74 × 378.38
  4. Step 4: Simplify right side
    639x = 361,632.90
  5. Step 5: Solve for x
    x = 361,632.90/639
  6. Step 6: Final answer
    x = 565.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.