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Finding the Fourth Proportional to 839.63, 1,259.45 and 326.63

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Solution

The fourth proportional to 839.63, 1,259.45 and 326.63 is: 489.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.63 : 1,259.45 = 326.63 : x
  2. Step 2: Convert to fraction form
    839.63/1,259.45 = 326.63/x
  3. Step 3: Cross multiply
    839.63x = 1,259.45 × 326.63
  4. Step 4: Simplify right side
    839.63x = 411,366.22
  5. Step 5: Solve for x
    x = 411,366.22/839.63
  6. Step 6: Final answer
    x = 489.94

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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.