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Finding the Fourth Proportional to 839.32, 1,259.04 and 254.29

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Solution

The fourth proportional to 839.32, 1,259.04 and 254.29 is: 381.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.32 : 1,259.04 = 254.29 : x
  2. Step 2: Convert to fraction form
    839.32/1,259.04 = 254.29/x
  3. Step 3: Cross multiply
    839.32x = 1,259.04 × 254.29
  4. Step 4: Simplify right side
    839.32x = 320,161.28
  5. Step 5: Solve for x
    x = 320,161.28/839.32
  6. Step 6: Final answer
    x = 381.45

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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.