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Finding the Fourth Proportional to 839.21, 1,259.28 and 376.97

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Solution

The fourth proportional to 839.21, 1,259.28 and 376.97 is: 565.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.21 : 1,259.28 = 376.97 : x
  2. Step 2: Convert to fraction form
    839.21/1,259.28 = 376.97/x
  3. Step 3: Cross multiply
    839.21x = 1,259.28 × 376.97
  4. Step 4: Simplify right side
    839.21x = 474,710.78
  5. Step 5: Solve for x
    x = 474,710.78/839.21
  6. Step 6: Final answer
    x = 565.66

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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.