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Finding the Fourth Proportional to 839.39, 1,259.09 and 400.68

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Solution

The fourth proportional to 839.39, 1,259.09 and 400.68 is: 601.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.39 : 1,259.09 = 400.68 : x
  2. Step 2: Convert to fraction form
    839.39/1,259.09 = 400.68/x
  3. Step 3: Cross multiply
    839.39x = 1,259.09 × 400.68
  4. Step 4: Simplify right side
    839.39x = 504,492.18
  5. Step 5: Solve for x
    x = 504,492.18/839.39
  6. Step 6: Final answer
    x = 601.02

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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.