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Finding the Fourth Proportional to 839.12, 1,259.08 and 514.32

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Solution

The fourth proportional to 839.12, 1,259.08 and 514.32 is: 771.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.12 : 1,259.08 = 514.32 : x
  2. Step 2: Convert to fraction form
    839.12/1,259.08 = 514.32/x
  3. Step 3: Cross multiply
    839.12x = 1,259.08 × 514.32
  4. Step 4: Simplify right side
    839.12x = 647,570.03
  5. Step 5: Solve for x
    x = 647,570.03/839.12
  6. Step 6: Final answer
    x = 771.73

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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.