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Finding the Fourth Proportional to 1,331.97, 1,840.65 and 999.83

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Solution

The fourth proportional to 1,331.97, 1,840.65 and 999.83 is: 1,381.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.97 : 1,840.65 = 999.83 : x
  2. Step 2: Convert to fraction form
    1,331.97/1,840.65 = 999.83/x
  3. Step 3: Cross multiply
    1,331.97x = 1,840.65 × 999.83
  4. Step 4: Simplify right side
    1,331.97x = 1,840,327.89
  5. Step 5: Solve for x
    x = 1,840,327.89/1,331.97
  6. Step 6: Final answer
    x = 1,381.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.