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Finding the Fourth Proportional to 839.14, 1,259.63 and 619.09

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Solution

The fourth proportional to 839.14, 1,259.63 and 619.09 is: 929.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.14 : 1,259.63 = 619.09 : x
  2. Step 2: Convert to fraction form
    839.14/1,259.63 = 619.09/x
  3. Step 3: Cross multiply
    839.14x = 1,259.63 × 619.09
  4. Step 4: Simplify right side
    839.14x = 779,824.34
  5. Step 5: Solve for x
    x = 779,824.34/839.14
  6. Step 6: Final answer
    x = 929.31

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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.