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Finding the Fourth Proportional to 839.30, 1,259.01 and 406.13

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Solution

The fourth proportional to 839.30, 1,259.01 and 406.13 is: 609.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.30 : 1,259.01 = 406.13 : x
  2. Step 2: Convert to fraction form
    839.30/1,259.01 = 406.13/x
  3. Step 3: Cross multiply
    839.30x = 1,259.01 × 406.13
  4. Step 4: Simplify right side
    839.30x = 511,315.44
  5. Step 5: Solve for x
    x = 511,315.44/839.30
  6. Step 6: Final answer
    x = 609.22

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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.