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Finding the Fourth Proportional to 1,332.98, 1,999.92 and 839.77

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Solution

The fourth proportional to 1,332.98, 1,999.92 and 839.77 is: 1,259.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.98 : 1,999.92 = 839.77 : x
  2. Step 2: Convert to fraction form
    1,332.98/1,999.92 = 839.77/x
  3. Step 3: Cross multiply
    1,332.98x = 1,999.92 × 839.77
  4. Step 4: Simplify right side
    1,332.98x = 1,679,470.97
  5. Step 5: Solve for x
    x = 1,679,470.97/1,332.98
  6. Step 6: Final answer
    x = 1,259.94

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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.