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Finding the Fourth Proportional to 839.88, 1,259.83 and 474.59

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Solution

The fourth proportional to 839.88, 1,259.83 and 474.59 is: 711.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.88 : 1,259.83 = 474.59 : x
  2. Step 2: Convert to fraction form
    839.88/1,259.83 = 474.59/x
  3. Step 3: Cross multiply
    839.88x = 1,259.83 × 474.59
  4. Step 4: Simplify right side
    839.88x = 597,900.04
  5. Step 5: Solve for x
    x = 597,900.04/839.88
  6. Step 6: Final answer
    x = 711.88

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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.