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Finding the Fourth Proportional to 681, 939.78 and 370.50

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Solution

The fourth proportional to 681, 939.78 and 370.50 is: 511.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    681 : 939.78 = 370.50 : x
  2. Step 2: Convert to fraction form
    681/939.78 = 370.50/x
  3. Step 3: Cross multiply
    681x = 939.78 × 370.50
  4. Step 4: Simplify right side
    681x = 348,188.49
  5. Step 5: Solve for x
    x = 348,188.49/681
  6. Step 6: Final answer
    x = 511.29

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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.